Muzan's sheer regenerative power exceeds anything in the JJK verse. Even low-tier, average demons are listed as high-mid while Prime Sukuna's is listed as mid regenerative power. Gyutaro gaps these regenerative powers pretty widely by no diffing a poison in mere seconds that was struck into his neck, the most important part of a demon's body. The same poison can stall these low tier demons for a day despite high-mid regenerative power and adaptability. Muzan > Gyutaro in terms of regeneration and recovery power. Mitsuri, whom outpaced Muzan in speed, didn't perceive her attacks slicing through Muzan's neck. None of Sukuna's cleaves will do anything nor will Furnace. That is not a win-con, it failed to really put down Yuji in close-range and only really killed Choso, who's not that strong anyway. Inverse-Square Law takes care of this.
Irrelevant. Those same demons, even with their regeneration prowess, died whenever they lost their head or got exposed to their sun. Not only that, burning their cells literally hampers their regeneration. Just heating up your blade is enough to weaken their regeneration through the sheer heat burning their cells. Yes, Muzan regenerated right as Mitsuri cut him, what does that change? Whenever Sukuna or his shikigamis damage Muzan, he will be cursed and get weaker. I was intentionally not going for this argument because honestly Sukuna doesn't even need this to win, but being honest, Muzan has no reason to be able to stay up after being cursed after a few attacks. He has NO curse resistance, and it's stated again and again in JJK that being cursed is enough to weaken and kill a person. He will get damaged, ignore it, and suddenly he's on the ground unable to move.
That was what happened to First Year Maki after she got SCRATCHED by a strong, but nameless curse. Sukuna's cursed energy is way more potent than that. Muzan has no resistance to curses, he IS going down.
Also, Furnace is stronger than any attack Muzan has ever withstood, so YES, Furnace would reduce Muzan to ashes and kill him for good. Fire Arrow sits at High 7-C, while Muzan's neck stays at 7-C. Burning demon's cells also stops their regen, that's literally how Yoriichi scarred Muzan to the point that he never completely healed. Sukuna's thermobaric explosions would literally puverize Muzan, and other Muzan supporters on this already agreed to this too, so no. Stop the cap.
None of JJK's 'poison" should even be considered here as Prime Muzan upscales from Gyutaro's 'poison' which can kill hashira and affect Tengen, whom has consumed poison since childhood, in mere seconds based on deduction of the sequences, i.e Tanjiro walking a couple of meters and Tengen spamming explosions before Gyutaro states he should've died and that the poison is indeed affecting him. Inosuke does so as well and he would've succumbed to these.
JJK "poison", in it's great majority, refers to curses, so yes, it is considered. Gyutaro's poison. What X character has or doesn't have doesn't matter. Muzan cannot perceive CE and cannot protect himself from curses, he IS getting affected.
I wonder, however, does speed equalization cover speed enhancements/increase in speed? If not, Muzan grows in speed/enhances his speed with blood and blitzes Sukuna with thigh whips or even arm or back whips. If yes, I can see Muzan tagging Sukuna in CQC as the narrator states that multiple arms/mouths is advantageous in a fight against sorcerers and each of Muzan's mouth inhalations either crush Sukuna and his shinigami or his blood turns Sukuna into a demon, with a small chance of turning him into a demon and thus a pawn or he instantly vaporizes due to having no adaptation feat on the level of Muzan's 'poison' nor will RCT cover that as their RCT is not that decent.
You clearly doesn't understand anything about Jujutsu Kaisen. No, Muzan is not able to tag Sukuna is CQC because of that. You didn't understand what the narrator meant by that, so let me explain that to you.
What you're quoting is: "Sukuna extra arms and mouths provide an immense advantage over other sorcerers". Why? Because of the other quote you purposefuly ignored. "Even when performing curse gestures, his hand's remained unfettered, and even when chanting a curs, his heart and lung remained unburdened".
Sukuna's body was MADE for sorcery, that's why Kashimo's X-Ray vision saw him as perfect. His multiple lungs and his multiple mouths allowed him to CHANT any curse faster than ANY other sorcerer. His four arms allowed him to execute hand chants faster than ANYONE, or perform them WHILE using the other hands to fight. Muzan creating multiple arms won't change anything, he cannot use sorcery, so it would be absolutely useless agaisnt Sukuna. Please, refrain from lying. If you do not understand X or Y, you can ask me about it, but do not lie. I don't know if you didn't know or if you did it on purpose, but refrain from it.
Also, I doubt Sukuna himself even has poison resistance feats on the level of Spider Brother. He has never resisted anything of that sort and he's not the king of lethal poisons or toxins either as that is a mistranslation. There might be something I missed regarding his poison resistance but as of now Muzan tags him once and he's done for.
No, he is indeed the King of Lethal Poisons. That name comes from the fact that, he, himself, is a lethal poison. Consuming any cursed object is toxic or humans, since anything that possesses cursed energy can and WILL curse you. That's why anyone who tried consuming Sukuna's fingers before Itadori (that weren't curses themselves) ended up dead. Sukuna is the most lethal poison (curse) of all. But it's stated over and over again in the series that Sukuna is also immune to all kinds of poison, so your BELIEF that Sukuna is unable to resist that fodder's poison is irrelevant. His page on VsBattle considers him immune to all kinds of poison, and so he is. If you don't like that, open a CRT, because according to the rules, we must use what is on the character's page. Either way, Muzan won't be able to tag Sukuna for reasons already stated in my previous posts.
If Sukuna decides to drown/trap Muzan via the shadow Muzan (as desperate as Muzan is and how he will do anything to survive) will just deploy his own domain, Infinity Castle, and/or create new constructs to defend himself against it and stay afloat, as shown in S4, EP1/7. Since the IC is massive or infinite in size, Sukuna would be forced to be crushed under the weight as that is how the shadow functions. Given IC's calculated Class P mass (Pretty sure) and Sukuna's, whom is Class G, (His page lists Class G but the calc he scales from lists Class M, I'm confused) would either be unable to move and get sliced into pieces in return or be crushed and die. The moment either Sukuna or Mahoraga are exposed to Muzan's 'poison' they're dead.
Sukuna can do that, but he has no reason to. At least, not before having the guarantee that it is the only way of dealing with Muzan, since Sukuna has never resorted to drowning an opponent in the shadows as a way to permanently defeat them (he only partially pulled Gojo in to let Mahoraga strike him easier). so all that you said is irrelevant. And once again, no, Sukuna wouldn't be affected by Muzan's poison (you mentioned poison, not his bio hax). Neither would Mahoraga or any other shikigami. Once again, you're simply spewing lies that makes absolute NO sense.
No matter what Muzan does, he would not be able to get rid of ANY of the shikigamis, as he cannot purify them, and Mahoraga WOULD adapt to his blood. He adapts to all and any phenomena.
Any of his Shinigami would be useless except Maho and even then he has no adaptive feats nor should be able to adapt to IC at all. What is he even adapting to begin with? And no, just because Maho adapting to Gojo's domain doesn't now equate to Maho adapting to IC as that is a fallacious comparison. There's no feat of Maho that compares to IC at all. Maho has never shown DC on that level and neither will he find a way to escape as IC is in a different dimension, only granting exit or entry with Muzan's or Nakime's ability.
IC, on VsBattle, is treated in the same way Domains are treated. That is, both are Pocket Reality Manipulation, and we have already seen Mahoraga destroy one before after SIMPLY being adaptated to it's effect, so yes, Mahoraga can and will adapt to IC, and will destroy it as soon as he does, just like we have already seen he do it before. Don't like it? Open a CRT. Nakime's page states that IC is an PRM, and Mahoraga CAN destroy those.
A case can be made for prime, healthy, non-drugged Muzan to utilize clones, the databook states that this is in-character and he does this every time. At worst, those clones should be approximately equal to Muzan's physical ability and have access to all of his abilities via Douma's ice-clone example. His efficiency in blood manipulation and power distribution should be superior to Douma's who has clones really close to his power.
Douma's Ice Clones that matched the real one's strength were an product of HIS kekkijutsu, not him simply manifestating them out of thin air. Other than that, we have never seen Muzan summon Douma just to use his Kekkijutsu. Also, that's not on Muzan's page. Get that added through a content revision first, since you not only didn't provide where that's stated in the databook, and that's also not on Muzan's page.
His cannibalism-technique to deploy his flash and lightning shockwave should render either Sukuna or his shinigami useless for an unknown period of time. Muzan will and has tried spamming this technique numerous time, only failing due to the drug weakening and draining his stamina.
"Should", "unknown". You cannot explain why nor how much, how can I debate with you about that? Either way, Sukuna won't be fighting at close range, it was already proven in the past posts that Meguna's favoured style of fighting is long range, letting his shikigamis fight head-on. Also, once again, Muzan cannot affect shikigamis. If he can spam that, cool, but that doesn't change the fact that Sukuna can retreat into his shadows and that this move won't do anything to his shikigamis.
Give Muzan access to a part of Sukuna's body and he'll be able to read Sukuna's memories through his cells and gain knowledge of his battle style, abilities, shinigami and grasp of CE and apply that knowledge into the battle.
Won't really change anything. He still cannot damage his shikigamis, Mahoraga will stay adaptating and all the curses accumulated from the damage he took won't disappear. He needs to attack in order to win, and if he just stops fighting back, Mahoraga and the other shikigamis will go on mauling him and cursing him to death.
At last, if we allow tertiary canon in this vs matchup then Muzan will just teleport to Sukuna and behead him as he has done before.
No proof provided, none of that is mentioned on his profile... so no, that's not valid. If he could do that, why didn't he just teleport to Ubuyashiki, kill him, and teleport away? He had no reason to walk over right into his trap if he could do that.
TLDR: Muzan via BFR, outclassing in overall stats if speed equalization doesn't cover that, skill-gap in CQC, potential knowledge access to overall abilities, high adaptive capabilities, clone jumping, too fast regenerative power and no win-con for Sukuna to actively put him down. TP insta-kill if we allow tertiary canon.
BFR won't work, since Mahoraga will adapt and break down IF. Muzan doesn't skill gap in CQC, he literally has no training in martial arts, he simply swings his tentacles around without no ounce of technique. Sukuna is literally used to fighting agaisnt multiple enemies from Heian era, with many diverse and unique abilities. Muzan has no clone jumping, he cannot adaptate to anything Sukuna does (cursed energy), you didn't show any proof that invalidates Sukuna's MULTIPLES win conditions and that tertiary canon you mentioned is invalid, since you not only didn't provide any proof of that, but that also contradicts the manga, since Muzan never did that move, even when that could have gotten him the win.
So yeah, nothing of what I said has changed.