Actually, he CAN move. He can go out and hit the 3, and move inside and use his size and strength underneath. We'll see when he gets there. I don't know about Conley, I think the feeling here is he'll stay.
As for Koufos, here is a youtube video. I really don't like these types of things, because they only show the positives, and not the negatives, but he does have great range, and a pretty shot:
http://youtube.com/watch?v=GqKECKeq3TI