Great post, matter. This is why you're seeing such an emphasis on "character" these days. Teams realize they need to try to get inside the heads of these athletic, high risk/high reward-type players. They need to take an educated guess at which ones have the dedication and attitude necessary to better learn their position in order to be successful at the next level. Some guys, like John McCargo, will never fully dedicate themselves to their craft and will never sniff at the potential that their athleticism gives them. Figuring out which guys have the right mindset for the job is an extremely difficult task, I'd imagine, but its more important than an extra couple tenths of a second on the stopwatch.
Lets hope that, mentally, Aaron Maybin has what it takes. We know he has the measurables.