How is Henry much different than CJ? We don't have a year of CJ's college stats to compare, but look at the similarities at the same age: Same body, same athleticism, both lefty shooters with raw offensive games heavily reliant on their jumpshots.
At KU, Henry took 354 shots, 164 of which were 3's. That's roughly 50/50. He got to the line 3 times a game which really isn't bad for college and the minutes he played, but doesn't suggest a very dynamic game at this point. His rebounding was impressive, however. And his other numbers were solid.
My point is not that he isn't a good player. I think he is. And I wouldn't mind adding another CJ to the team. But I'd bet the guy is 2 years away from being anything other than a gunner.