The 4th member is optional, you c*e anyone you like. Here I use tenten for example.
Initiator: Kiba + Kimimaro
Poison stacker: Kiba Kimimaro Tenten, all of their ults are AOE Taijutsu
This formation has tough frontlines. Both Kiba and Kimimaro can soak lots of dmg.

What do you think about boy Obito as the 4th? I'm thinking he will do well because his mystery causes Ignite on 4 people