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I think Michael Beasley is a great player, but he will not start over Derrick Williams. You can compare college stats all you want, but college stats don't matter in the NBA.
Similar to Derrick Rose, Williams was drafted because of potential. He proved throughout college that he is determined and capable of improving his game.
T-Wolves GM David Kahn has also gotten a lot of heat (and rightfully so) for his choices on draft day in recent years. Kahn will want to prove he made the right choice in drafting Williams by giving him as many opportunities as possible.
Derrick Williams is very good at playing away from the ball, unlike Michael Beasley, who occasionally will slack off when he doesn't have the rock.
Beasley also demands the ball too much. Last season, the T-Wolves were short on talent and needed someone to take most of the load. This year, they added Williams and Rubio and cannot give someone that many shots while only shooting 45 percent.