Charles Matthews going the non-agent, take a gander at the draft route. Unlike Mo, I believe this would be a very poor decision. There is a lot to work on, and at 6'6, he isn't long enough to make up for those deficiencies yet. 31% from 3, 55% from FT, and little to no handles.
He needs to develop his dribble entry and shooting quite a bit to even be a consideration for NBA teams. If those showed big improvement next year it's possible he could be a late 1st rounder.