Williams and Bachero are both very quick for a big and (based on what I have read and seen of Paolo) I don't think they would struggle if forced to guard a slightly smaller PF-type player. Most folks project Banchero as a PF in the NBA and think that he is more than capable of playing a PF role in college. I think Williams' presence is one of the reasons he is coming to Duke as he does not want to be limited to the post in college. Duke has a ready-made big who will allow Paolo to use his great mid-range skills. He and Williams are going to be devastating in the high-low post game.