Assuming this is not in a cave ._.
What does he have to put them down?
White Rage? Whatever he does to kisame he can heal from and Itachi can put up Susano'o faster than lightning ._. not really going to be able to land a hit.
And meanwhile in WD, Kabuto's agility is severly going to be lowered....Allowing Itachi to skewer him with Totska
There are many ways to but kisame down. CQC he is superior, any strike will cause serious knock back. The force nature can even snap his neck, which Sakon can add an additional damage. But I rather finish Kabuto's 2nd exploit before going more in depth.
WD is a non factor since water is an inorganic material, while he can control on contact.
Sussanoo loses with Sound and something else that I won't tell until exploits are finish.
how does the counter poison? Kabuto admitted he knew little to nothing about Deidara, so it's unlikely he's aware of C4.
Depend on which poison you talking about. Smoke screen, imbedded Iron Sand? These can either be dodged or liduifying his body to dilute and remove from the body. Iron Sand gets Muki Tensei.
Kabuto already gather enough info after so no knowledge is no no. Kabuto didn't understand his perspective not his jutsu.