i have a sneaking suspicion that gama has enough respect for naruto for staying on so long, and for even summoning him, that even if he wont obey him, i doubt he'll just sit around, or unsommon himself once naruto does summon him (if indeed he can and will, remember, there's no garuntee that after the neji fight , which though it seems ages ago was really just earlier in the day, naruto will have enought chakra left to be able to summon gama.) there's also nothing saying that naruto will indeed summon him, or even try, or even fight as of yet...sasuke could take care of it before naruto and co. even get there...personally i think thats a bit unlikely, but its a possibility.