When Diaz was finally eligible, we sat him for the rest of the reason because (1) he was not ready to play big minutes and (2) we had enough players to run a four guard lineup. It sounds like Vucetic is not ready for big minutes, but it is also not clear whether we have enough depth to run a four guard lineup with Ubel, Andre, and Kyle rotating in at the post.
Picture something like what Drake ran back in 2009 (mind you once Keno Davis took this offense to the Big East it failed). We put Benny, Ray, Rivers, and Talley out there with the above three mentioned playing the post. Let Jordan Tyrance back up Talley as a quasi-4. Bring in that JUCO walkon to shoot from beyond three. If the point guard can penetrate and kick out to shooters on the perimeter with a post guy to rebound, It may work (but probably not). Keno Davis took an unknown squad with a losing tradition and made them a NCAA 5 seed which barely lost in the first round to a very talented Western Kentucky team (two NBA players on that squad).
If we can make something like that work, sure red-shirt Vucetic. It would probably do him a lot of good. Otherwise, we almost have to play him.