With all due respect to you and i mean no disrespect towards you on this but i absolutely cannot stand or get behind the " what if he gets injured" argument.
If thats the case and they are so worried about injuries, why even play college ball period? Why not graduate HS and sit out a year to train specifically for the NBA? Why not go the G-League route, get professional training, get exposure and go up against some ex- NBA players or players fighting for spots themselves? Chances are 75% of those guys are better then the guys you play with/against in college.
If your so worried about getting hurt then your obviously looking into the wrong profession. Injuries aren't a matter of if but when. There going to happen.
In Jalen Johnsons case i tend to believe this kid is a head case. There were reports of his attitude and motor in HS, now this? You could see his piss poor demeanor on the bench, low motor in games, arguing with team mates and chirping at opponets after losses.....Hell tbh i dont think he wanted to be playing college ball im the first place. This kid has obviously got some personal issues.....