fire main is okay. He was a weak main before so he is getting a buff is very good since he deserved it. As for water main i think atleast oasis remove the absorp chakra feature since it too op. As for critical chaos from water main, just build ur crititical attribute, or use team who has immune ninjas, or use atleast 2 healers or just use that water main if u want. Or u need to increase ur initative to have a good chance to defeat ur opponents XD