No prospect coming out of high school is a finished product and by no means was I inferring that Dewan was one. When Dewan got to Miami he was a 6'10"+ athletic big oozing with potential. He dominated in high school, on the travel ball circuit and at the national camps.
We'll never know for sure, but if you take what fsu's staff did with Raiquan Gray for example. This guy wasn't highly regarded. Looked more like a DE coming out of HS than an NBA prospect. Yet, it looks like he may get drafted in a few months. If fsu can develop Gray into that, there's no telling what they may have done with Dewan.