If we're honest here there is no player metric in the game that could be used to truly determine who would make a good mentor. The requirements we have at present are just a gauge of time played and rudimentary experience in each group role. The only feasible solution I can see is some mentor equivalent of commendations that allow sprouts to rate good mentors; maybe even give those with higher commend counts priority access to the channel. Of course even THAT could be abused if not implemented with some foresight.

I still think we would do well to give it a little more time to see how the mentor chat settles down on each server though.