He won't be able to handle it. Too dark for him (like it was for Gai), and not to mention he only has Taijutsu which isn't very useful for some missions. ANBU are generally more versatile in combat.
OT --> Definitely Sasuke. No one else from konoha 11 though (even Naruto and Neji)...they won't be able to kill as easily as Sasuke imo. Also Naruto like lee doesn't have that much jutsu (and isn't really good in a team).
Shino only, you guys forget that in order to join the Anbu
You have to kill guys left and right. So far everyone in k11 has shown emotion
Except shino.