Right now Angel's game is better suited offensively to the 5. He has trouble if he gets the ball more than a few feet from the basket.
Now that can be chalked up to inexperience as he still has three years to play college ball and with his work ethic you would expect to see all facets of his game improve.
Right now we need him to play in the middle, but if Carter (C) or Anderson (PF) show the ability to play the center position maybe Angel can move over and play the 4. It would help his rebounding and better keep him out of foul trouble.