There are a few kage level nin among the alliance back up. That mountain sandwich guy, Hiashi ( Repelled the Juubi with no bs power up ), and then there are Kakashi and Gai. I'd power them up exclusively with a bigger charge since they are about the only worth while nin in the bunch.
Think of it this way, Kishi didn't bother to develop the rookies in all of part 2, so in the last fight he gives them a bs power up just to force some relevancy upon them, even though the enemy is infinitely more powerful than they can ever hope to be. That is contrived as hell. So yes, the rookies are useless, and what they're doing on this fight will probably not have much of an impact once the Juubi mutates again.