while kabuto is in a flashback pein stabs him in his snaky little face.
How do you expect him to do that? .Itachi alone can kill kabuto if he wants to...
Kabuto could manipulate CT. He wins mid difficulty. He can't be hit and Pain has no fire techniques to evaporate him when he liquidfies or lightning element to paralyze him when he liquidfies
Kabuto is not that tough. The only reason Sasuke and Itachi haven't wiped the floor with his sorry ass yet is because they need to release the Edo Tensei first off. 6POP would probably fare the same, and there are freakin 6 of him. And if it's the new six paths, with the sharingan/rinnegan/bijuu, well, use your head here.
Pain wins this with ease.....apart from the rinnegan, kabuto has to battle six paths of pain..if he fights them at the same time....he is a gonner.....but one at a time...he mite take out at least three..but seriously...pain will defeat him flat out