Theres no way you can use scheme as a cover up for their lack of defense. If Corey can stay in front of his many than they can too. Defense, much like rebounding is 90% effort. We can blame Hewitt for a lot of things but our guys getting beat off the dribble like a drum is not one of them. VG and SW have been terrible at man-man defense since the moment they stepped on campus.
So go zone? Why continue to play man-to-man when you don't have the personnel to play it? You certainly don't try to press with a bunch of lazy defensive players, that's for sure.