No, I really don't think he is going to "blow up" in college. I cannot understand how you can not score more in high school games if you are as big as Riley (and for all in love with star ratings, don't say it is because they don't go inside in high school. And, if that is the case, how can he only score 16 points in like 7 games at Boo Williams?)
Plus, isn't he listed at 6'10-6'11, and so, the can't teach height thing doesn't exactly fit. It is not like he is 7'2.