No one is asking him to be a finished product on day one. People forget that guys like Wong and others were thin coming in, got minutes anyway, and they weren't nearly as developed offensively. This is a guy that can score at all three levels, I expect him to do most of his damage in the midrange and from deep, until he gains confidence hitting the lane. Keep in mind, with the proliferation of one and done, it's not like he is going to spend most of the season playing against grown men with NBA talent. A lot of the dudes that are stronger(due to age), will not be as athletic. The athletic, strong guys are usually long gone from college. It's the Zach Edey concept: If they were legit NBA players, they likely wouldn't be playing in college as upperclassmen.
Amazing that if Bethea hadn't signed with Miami, a lot of people here that are trying to sell us on this dude not being legit would be saying "Why didn't Miami close the deal, he's going to be a legit starter at (Insert School Here)." He isn't a finished product, but talent like this, will figure it out as he goes along. Never mind the fact that he will have veterans around him to help out. No one expects him to carry this program, but he will be a valuable piece. Barring him having an early season injury like Walker, Bethea should be fine.