My draft rater doesn't actually hate KPJ (+0.2 offense, +0.5 defense), so maybe I'm unnecessarily low on him because I just watched him play poorly and have heard people talk about his possibly bad attitude. My point was mainly that, like Dort, I think he really impressed some people early in the season with some highlight-reel plays, then pretty much disappeared. But maybe he hasn't lost as much stock as Dort.
I'm much higher on Williams than on Clarke. I think people are misevaluating Williams in part because they think he's some 23-year-old curmudgeon who's done developing. He'll still be 20 years old on opening night next year, the same age as some freshmen like Langford. He's still clearly improving and expanding his game, and if that trend continues for another couple of years he could be really good.
Clarke is a nice prospect too, especially on defense, but I don't see the same degree of upside there. He's significantly less skilled than Grant offensively in spite of being more than two years older than him. He also lacks Grant's impressive frame, which may limit his versatility on defense and will definitely limit his ability to attack the rim on offense. He'll be shooting floaters on plays where Grant will be shooting layups or going to the free throw line, and even though he has nice touch on those short midrange shots it's tough to create efficient offense that way.
Overall, I'd have Grant 2-7, Clarke 15-30 very roughly.