Eric Mika is pro material already, and waiting a year will not improve his chances very much. Sure, next year will not be the draft talent logjam that 2017 is. But so what? Why not enter the pipeline as a free agent? His skill level will improve considerably better .... over staying in college.
Read this, about how the NBA is getting more serious about the D League. Here's a guy that is going to make serious money by working on what his team seeks.
https://www.nytimes.com/2017/04/29/sports/basketball/houston-rockets-daryl-morey.html