Can't say I'm exactly "happy" we kept our picks, way too early for that. Like you say, rollie, we haven't seen much of Langford. And, although I like Grant, Edwards and Waters, SL is not a real good indicator of future success.
That said, Edwards has the best chance to actually show something in his rookie year. He will be called upon to do what he does best which is shoot, and in limited minutes.
G. Will is indeed a tweener, but he has the BBIQ, the work ethic and the skill to be better than many other tweeners that have come through the organization.
Waters I fear is simply too small. Great BBIQ, passing and shooting, but he will get burned every time on the other end.