Knowing what we know now, lets pretend Thompson was in this draft, where would he rank? Zero doubt he would be behind the top 3. I'm not sure he's even in the Exum/Smart/group of PFs tier. He's a better shooter than Harris and a better defender than either Stauskas or McBuckets, so he would be better than them. So, I think he would probably be the 10th best prospect but end up getting picked at 9 to Charlotte.
I think he'd go 4th, before taking salary considerations are taken into account. After 3, I think we're talking about some players that carry some significant risk, if you're weighing them against a guy we know can be an effective NBA player. "After 3" if we're assuming that a big who's body is falling apart from a couple years of playing basketball is somehow a remotely safe pick.
I mean, after that, we're talking about 6'3" guy that can't shoot, a guy who's only been seen playing against Australian competition, a PF that didn't dominate the B10, a 6'9" PF that might just not be big enough for his style to translate, and a tweener F without much offensive game to speak of.
Some nice prospects, but if any of those guy didn't turn out to be good NBA players, it wouldn't be shocking.
Klay being older and about make $15 mill/year probably puts him in that 9 range you speak of.