Concerning the return of Lee:

How do we know it's Lee? Couldn't Gai have used the "henge" technique to throw off Kimimaro? Kimimaro seems insanely strong (stronger than a jounin?), and if Gai felt outmatched, perhaps he felt he could use Kimimaro's underestimation of him (as Lee) to his advantage.

EDIT: I hadn't finished reading the rest of the topic before I posted this. Having read the topic now, I realize that this has already been brought up. I think my explanation of why it might be so is unique, though, so I'll let it stand.