Pretty fair and accurate analysis/scouting. Thompson does come up with a few highlight reel defensive plays, but generally his post defense is subpar - mainly because of the reason Givony listed.
I think he's got the physical tools to become a much better defender. He doesn't have the hops to be elite, but he's got the size, strength, motor and coordination to become a good defender. It's all about discipline and using his head at this point.
In terms of offense, I hate to read that his post game is not becoming more refined. Again, a guy with his attributes should have a go-to move. Hopefully Reef can work on this with him. I do think that Thompson has a lot of potential in his jumpshot, as well as his ability to defend the faster combo 3/4's (ala Orlando), and pass the ball better.
He's not going to be Chris Webber, and he might just take that "Channing Frye Freefall" and see his performance diminish every year. You just don't know. But I'm in the school of thought that Thompson, at worst, will be a solid rotation big, and at best, a 17/10 unselfish PF who is an average to above-average defender.