I've sent the raw panel where Urahara said that to Arc to translate , but from what i've seen Urahara says he got stronger since his fight woth Ichigo. What happened at the end of the fight ? He lost his forms and powers.
Urahara sau the hogyoku rejected Aizen
Ichigo said Aizen's atleast suconsciously wanted be just a normal soul reaper. So possibly hogyoku fullfilled that wish.
Even going by both theories Aizen lost the powers. Aizen getting stronger could just mean he got stronger from his normal base form. If Ichigo grow stronger from his Dangai training i see no reason why Aizen wouldn't be able to do the same.
Muken Aizen could fight Yhwach, that Yhwach was the strongest Yhwach in the series, stronger than how he was when he beat up HoS Ichigo, Yhwach destroyed KS, this at least should put Muken Aizen between HoS Ichigo and TB Ichigo, as Yhwach felt that he should destroy KS just as he destroyed Tensa Zangetu.
HoS Ichigo is above TS Ichigo who possesses the power that surpasses Dangai Ichigo who was above Hogyoku Aizen.
Yhwach > Muken Aizen >/~ HoS Ichigo > TS Ichigo > Dangai Ichigo > Monster Aizen.
That is one scaling chain.
Post-Ichibe-fight Yhwach + Mimihagi
attacked the Seireitei with massive energy to
prevent any soul reaper from coming, however, while being sealed by the chair, Aizen’s 90 Hado almost destroyed the black energy not to mention that Hado was incantation skipped,
he then effortlessly released an amount of Reiatsu that could erase the black energy from Yhwach.
Muken Aizen >> Sealed Muken Aizen >/~ Almighty Yhwach + Mimihagi who was probably stronger than TS Ichigo.
That's the second scaling chain.
Now looking at Kisuke’s statement, he said Aizen became stronger than when he fought Ichigo, which means Aizen rn is stronger than the Aizen who fought Ichigo, which Aizen did Ichigo fight? He fought Butterfly Aizen then Monster Aizen, after that the fight stopped because Ichigo lost his powers and Kisuke sealed Aizen, so Kisuke’s statement should apply to those 2 forms, Butterfly Aizen and Monster Aizen, usually when we get a statement like that we assume that he is stronger than the strongest form from those 2 which is Monster Aizen, also looking at the feats that Muken Aizen performed, it's clear that he is stronger than his Monster form.
Also it majes no sense for Yhwach to release someone like Aizen who by statements should be far above the likes of Ichibei considering all the intel he and the quincies gathered over the years.
Yhwach didn't know how strong is Muken Aizen, did he?
I mean it also makes no sense for Yhwach to release someone who can easily manipulate but we saw that it happened right? so this isn't a valid argument.
Didn't Aizen lose the transcended powers from the hogyoku? The only abilities he still has from it are immortality (doesn't seem to regen as fast as before) and fusing with his Zanpakuto .
Imo Muken Aizen is not as powerful as monster Aizen
Those 2 statements from you contradict each other, if you want to say that Muken/Tybw Aizen is fused with his Zanpakuto you have to say that he is above Monster Aizen, Aizen said that when he fuses with his Zanpakuto he will reach a higher state than his Monster form.
although his regen doesn't seem to be as fast as when he fought Ichigo
It just means Yhwach can neg regeneration, which makes sense because any ability he sees with his eyes becomes useless against him.
You can't fix a broken Bankai atleast normaly, Yhwach destroyed the bankai in all futures that's why Orihime couldn't fix it
It is clearly implied that if it wasn't destroyed by the Almighty, Orihime could have rejected that, but she couldn't, it isn't just because "oh Bankai cant be fixed" it's because of Almighty.
Ichibei was destroyed by Yhwach but he still came back. Aizen also came back after getting absorbed or destroyed or whatever.
It's because Yhwach didn't bother himself to change the future at that time and neg Ichibe’s regeneration (that happened because of Ichigo).
Also the "Almighty can change the future" wasn't introduced at that time, probably Kubo decided that later? we don't know, what we know is that Yhwach saw that and didn't act for some reason.
Aizen came back after Yhwach was killed.
Also in the final fight Yhwach was under KS , in his mind he was fighting Ichigo and Renji both of whom don't have regen so i don't even see Yhwach actively trying to neg regen.
No, he was fighting Ichigo and Aizen in his mind lol, and he went to kill for both, not just for Aizen.