lol you guys are out og ur minds.
Forgot kisame he already admitted he cant take on two tailed beast host at the same time. So ever said kisamem just failed there.
Itachi needs someone strong with him to have enough time seal those bjuu hosts.
Nagato has the best chance of holding his own after how he dealt with killer bee and naruto. But nagato is paralysed and that means he cant fight directly(he need his pains to make this work in his state) with these fast bjuu hosts.
Orochimaru got weakened from just fighting naruto 4tail mode and sasuke trolled him later. Plz guys no chance.
So I conclude everyone is screwed the best chance would be itachi and nagato. But nagato needs his pains that would leave itachi by himself which can't win alone.
Tobi's currently is very hard to beat I feel most are underestimatly his position in the manga now.