World logic and manga logic are not the same thing.
In bleach world logic, attacking Mayuri in that state just spreads the liquid around. It does not damage the liquid, nor does it cause it to evaporate.
Mayuri is not a man who likes inaccuracy in statements. If something as simple as a cero could damage him, then he would not make such a blanket statement of him being immune to any/all attacks.
Can Ulquitorra kill him before he goes liquid - quite possibly (even though he appears to be able to survive lacking most of his body.....)
However, once he has gone liquid, I see nothing that anyone else has that can damage/hurt him.
Once everyone is poisoned and he is liquid, then it is game over for everyone involved.
As long as that technique is not banned by the rules of this tournament...
Technically, he is still in the fight - it is the same as Tobi going to his alternative demension (Naruto) - however, he no longer can partake an active role in the fight once he has activated that move (whereas Tobi has a time limit before he is forced to reappear [to use him as an example])...
If a mod could comment, that would help.
If allowed, then Mayuri wins (in my opinion) - as I see no one being able to beat him before he poisons and then liquefies.
If not, then Ulquitoria wins.
Zommari and Marechiyo have no chances.
At the same time, one can also say the fight could potentially end in a draw. If Mayuri were to use his Bankai and then liquidize himself, all Ulquiorra would need to do is just keep his distance. I'm sure Sonido is faster than the gas.
Omaeda? Is this a joke?
If Mayuri can't use Kido (namely, barriers to stop Amor), then Zommari will f**k him up good. He can actually kill Mayuri if he makes him drop his sword - that way, Mayuri won't be able to liquefy himself and escape.
However, Ulquiorra will pwn Zommari even unreleased.
Ulquiorra would win this easily. He outclasses zommari in everything bar speed. Mayuri lacks the nessariy physical feats, omeada is just fodder in this matchup.
LOOOOL, I'm sorry for mayuri,who seems pretty strong, but ulquiorra was likely the strongest espada: segunda etapa??? such a power!
Ulquiorra takes this fight comfortably. We know he's stronger than Zommari and Omaeda isn't a factor. Mayuri wouldn't be able to defeat Ulq in his first release unless he gets some very favorable conditions, not even factoring in his R2
If Mayuri had preptime I'm sure he could cook up something that could face Ulquiorra, but I'm assuming he doesn't so Ulquiorra takes this quite easily.
Interesting battle. We have two espada and one captain. I voted for Ulquiorra because I think he has bigger guns to inflict fatal damage and I think along with speed.
Mayuri would win. Hes the most dangerous here. Ulquiorra said there were 3 espada stronger than him. So theres no "hes the strongest espada". Along with that he can't regenerate internalorgans, which is what Mayuri's poison targets. On top of that he has a bag of tricks including the liquid form. Zommari could probably use amore on Ulquiorra tbh. I don't think it would matter with Mayuri. He could do a Byakuya if the other 3 aren't choking already. You can't beat him straight forward, but these opponents are the straight forward type. Maybe not so much with Zommari.
Mayuri would probably be able to poison Ulquiorra, but he'd still be taken down, provided Ulqui doesn't give a damn about poison and goes for the direct kill with speed that Ichigo shouldn't follow. And like I said, liquification should be considered "can't fight anymore".