McKenzie starting at PG and playing 20-25 mins isn't a bad idea. There will be more than enough talent for him to give the ball to for scoring opportunities. We simply need him to have a steady hand, not turn the ball over and distribute. He may not be a defensive pest but if he's just contains defensively, he'll send players into help defense of guys like Olaniyi,Otchere,Ochefu.
He's shown he can do these things somewhat as a Frosh. Now with experience and better talent around him. I think he will be very solid.