On Pierce, here's a link that I posted before:
In this game, starting at the timestamp, Pierce has assists on 3 straight possessions. Nothing spectacular in those 3 plays, but point guards have to make the easy plays when they're there, too. If I remember right, the reason I went out of my way to find that game tape was because he had a double-double with points and assists or something like that.
I think he has the ball handling and playmaking abilities to be a PG, my impression is just that on his HS team, he didn't play there much because they've had possible college recruits who were the size such that they could really only play PG. Plus, it might be a bit of what happens here when people see his size and strength and assume he can't be a PG.
With both Pierce and Moore, I think that sets up the PG position well on a post-Lipsey team.