I think you have to take the AAU circuits for what they are; they promote a lot of 1-on-1, individual play over team-oriented play. Generally the athleticism is very high at the elite AAU events, but the team flow and defensive schemes not so much.
If you're looking for a pick-and-roll lead guard or a wing capable of having the offense run through him, those are very good showcase events. If you are looking for a "glue guy" to do a lot of the little things as a background scoring option, those AAU tournaments aren't great evaluation areas.
I have not seen Pete Nance play in person so I'm not commenting on him directly, but just trying to frame the data from AAU ball this summer.
To me, AAU for say a guy like David DeJulius is a more important data point/evaluation showcase than AAU play for a center or tall wing rebounder/defender.