@Assalt
Gonna pretty quickly run through all of this so it doesn't seem like I'm leaving anything out.
"Dying to an attack is dying to an attack. Just because it was dramatic and took longer does not mean he was more durable than NEO Mettaton. NEO was a joke so of course it would be funny if he quickly explodes. All that matters is that he was one shot and so was Sans."
1. I did not say he was more durable than NEO. I said he took the same type of hit better than NEO.
2. "Dying to an attack is dying to an attack." What you are trying to imply here is blatantly false. A character being hit by a nuke and reduced to scattered molecules is not at all comparable to a character who is hit by a nuke, is shown to be fully intact, but soon collapses dead from the damage. "They both die" does not mean the same exact thing happened to both. You know this as well as I do.
"In combat Sans does not teleport around multi-kilometer ranges."
This is wrong on a multitude of levels. First, you're assuming that because Sans didn't do this against Chara, he can't do it period. This completely ignores the fact that Chara was up in his face the entire time in an enclosed area, so he'd have no reason to do this against them. Second, if we directly see Sans use long range teleportation (which we do. I even linked it), there is no reason to assume he can't do this before he's even been physically engaged by his opponent, who is standing several kilometers away.
"All Might has shown his willingness to KO with shockwaves many times before. He doesn't need to physically hit fodder to beat them."
Again, implication that Sans will instantly be knocked out or killed by anything All Might does. The point isn't that Sans tanks this shit like nothing, which he obviously can't. The idea is people seem to be suggesting any single hit, no matter how indirect, will instantly incap or kill Sans, no matter what, which is blatantly false.
"The only chance Sans has is killing All Might before he can do anything, but All Might isn't a sitting duck either."
No. This is blatant bias against a character, again implying that All Might doing anything leads to a win because Sans is so frail, again ignoring teleportation of himself, All Might, changing of gravity, and a multitude of other factors. It is a disingenuous look at the fight.
"He can dodge and is very mobile, even being able to achieving pseudo-flight with mid-air punching and jumping."
Please explain how he dodges teleportation that does not need to make contact with him to activate. Nobody is making the argument that All Might can't dodge anything Sans throws at him, but he can't dodge instant teleportation (which isn't even an attack).
"Gravity may or may not counter that, but even if it does, All Might can still take this."
If he couldn't take this at all, this would be a stomp. Nobody said he had no chance, but ignoring something Sans can do doesn't make it go away.
"The only time we see Sans porting all over the place is in fan animations, which obviously aren't canon."
Except, again, we see him teleport a very long distance. We see him teleport his opponent numerous times during his fight. He dodges a character who is much slower than he is in terms of reactions because he has no need to teleport, but he very clearly can based on what is explicitly shown.
"We barely see him move while fighting Chara."
...you...you mean because this is a turn based RPG where these animations don't even exist except in the case of Sans?