Boone's best case is PJ Brown. If everything works out the way the hope that's what they could have. And he's far away from that. Boone may provide interior defense, rebounding, and shot blocking but that's all and he doesn't even do those well.
He doesn't do anything well enough to even be worth the Knicks time right now. I'd rather grab Saer Sene at 20 and reach and take James White at 29 than have Shawn Williams/Mardy Collins at 20 and Boone at 29.
Boone just is not worth selecting in the first round. If he wasn't a legit 6'10" he wouldn't even be considered a first round pick. GM's are still holding on the "can't teach height" ideal and giving Boone a pass for his across the board lack of game.