Would Seth Curry be an unfair comparison? Used to lead the Blazers in +/-... Of course the obvious comparison is an even-shorter CJ.
I am sure there is a list of 7' players who sucked in the NBA basketball that would allow us to say height/length doesn't mean shit. It would also be true, but at the same time, it can also help.
Yeah, almost none of the blue chip guys used to jump so this list is not just incomplete, it's pretty useless.
I believe that is just how they rate them. Their actual mock draft has him at 3 https://nbadraft.theringer.com/mock-draft