Very astute analysis, however, I wouldn't say Vander's inability to get low on his drives is so much a product of coaching, as it is natural body lean/athleticism. Not sure you can really coach it. You tend to either have it (Wade), McNeal and Mayo to an extent - or you don't (Vander). Vander is a very upright player. Perhaps with some additional strength he'll get some different body lean capability...but just don't think it is something you can really work at...body either allows it or doesn't..
Certainly, some guys have naturally better body lean than others. Butler was terrific in this respect and one of the reasons he was a great driver. However, Vander is very athletic, and I believe he could have been taught to play lower to the floor. You're right to certain exact, he may never have the body lean of McNeal or even a Todd Mayo, but it could be much better than it is today.
Instead, he is almost 100% upright and consistently uses his off arm to clear/shield defenders, which is a horrible habit. Similar to his jump shot, playing upright wasn't a big deal in his youth basketball days because he was so much more athletic than the others kids, but now it is hurting him.
I like Vander and I see value he brings to the game outside of just scoring the basketball. However against high-major teams, he will be a negative in the half court because he's not an outside shooter and he can't get to the rim. If MU had a big-time scoring PG, along with Jae and DJO, Vander's lack of the offense from the wing wouldn't be so glaring.