Sorry, to clear misconceptions: i am debating how cerberus/other summons make katsuyu useless in this fight keeping it bussy so it can't help tsunade. And when i say regeneration i mea growing new body parts (which is not the same as multiplying)Here I thought we were arguing Tsunade and Animal path. I guess that wasnt clear.
He multiplies. Nothing is stated about regeneration, dont know why you are bringing that up. If there is nothing to multiply then its not happening.
Being able to kill Orochimaru is not enough?
Where will Cerberus be jumping to? Right at Katsuyu, he is in the perfect place for acid to hit him. As I stated he will be coming for Katsuyu, Katsuyu doesnt need to play around and try to hit him.
Being able to kill someone like orochimaru is not enough to assume the acid would "disolve" a dog that tanked Odama ransengan and KCM Naruto's FRS and is about the same size as manda. Katsuyu can't bring up that much acid. At the most she could hurt a big part of cerberu's body, who would grow a new part.
Once cerberus sees the acid coming (he has rinnengan pre-cog after all i guess) he jumps back, like manda escaped, by cerberus does it in the air. Or he simply tanks the acid.