I am curious as to why you think he would be wasted at PG. In my experience the PG position can score just as effectively as any other position and perhaps even more so in the motion offense. Alves is the better player so I would play him at PG so the ball is in his hands more. Realistically neither is a great option at PG based on their BH and PA but of the two I think Alves is your best bet. If you go up against a M2M defense and the match up is better for him at SG I may slide him over but Alves would be my primary PG.