The argument you seem to be implying here is that Roby can develop in style as opposed to developing as a minor leaguer, which is likely where he would end up if drafted.
However, it's been noted that Roby tends to struggle on the court when he's needed to step things up in the classroom. As a pro, he's got nothing to work on but basketball.
Some guys need the structure of college coaches telling them to work or whatever. That doesn't seem like an issue for Isaiah at all.
He absolutely should go and will be drafted. Hopefully he can crack the first round.