I agree with all your points. Chriss is a player that has risen fast, but that rebounding scares the hell out of me. That's a skill that translates, so if he struggled (to put it mildly) in college, how bad is he going to do on the next level? This screams of a lack of instincts, timing, motor, and/or positional strength. A lot of times you have these athletic players rise (see Swift, Ty Thomas, etc.) and bomb at the next level. He could be next.
So I hadn't watched Washington much but I heard something on a podcast that helped explain his poor rebounding production. Apparently UW's switch pick and roll so he ended up defending the ball handler on the perimeter more than he was around the hoop to get a rebound. His rebounding numbers are still terrible, but maybe if they ran a different defense he would be a below average rebounder instead of a historically awful one.
The experts say he's a legitimately bad defender with below average athleticism and question how effective his can be without the ball in his hands.
Mike
The defense obviously isn't good but I'm a firm believer that players who exhibit high basketball IQ on offense can eventually do so in team defense. I think he will become a good enough eventually to at least not kill his team.
As to not being effective without the ball, he's a great shooter off the ball and often scored running off screens for MSU, so I don't agree with that.
His shooting, rebounding and passing will make him an absolute steal if he goes in the 20's. Despite where he is being mocked, he has 3 workouts scheduled with the Bulls, Bucks and Magic all who pick in the back half of the lottery so I would be surprised if he slips as far as DX does.