But he has to summon gamabunta. I really hope he uses it to save the town against a spastic gaara in his stupid shadow (haven't actually seen it) form. If he summons gamabunta then somehow the fight made its way out of the stadium. If he doesn't summon gamabunta I'd be damned sure it wouldn't be enough to break the sand barrier. Also, Jaraiya probably trained that frog for a very long time and he summons that frog the majority of the time, and that's why it beat closet-pervert. So he needs a frog that can destroy the sand barrier.

Also, to say that summoning gamabunta took almost all of kyubi's chakra, you are saying that the fourth hokage had chakra enough to summon gamabunta and enough to fight the fox and enough to perform the naruto seal? Jesus, the hokage had a lot of chakra. I honestly believe that kyubi could summon the frog and still have insane amounts of chakra left. You are asuming that kyubi gave naruto all his chakra in the pit. He probably only gave him enough so that Naruto's child body wouldn't explode. Also, Naruto was given more chakra in episode 62 when he even claimed "I feel stronger than when I trained" (i.e. I have more chakra).

The only way gamabunta is getting summoned is if he does it outside the colliseum. No question. And if he goes up against gaara and he's about to die, hopefully he goes nine-tails like he did with haku. But I'm thinking the writer is trying to prove that naruto is more resourceful than back then, and he doesn't need kyubi as a crutch.