Agreed on the Neji part. Kurenai was leading a team of Genin soon after becomming a Jounin, there is no reason why Neji shouldn't be doing it either. Having two Jounin on one team should make it really powerful, and I hope they don't ruin Gai's team by having Neji just learn two or three more techniques and nothing else.

The only reason could be is that Neji could be on some sort of list to become a team leader, its just that there are other Jounin ahead of him who may be teaching. That or he has recently become a Jounin and its not the right time of the year to be assigning Jounin's to Genin teams.