I tend to agree. Wagler's super-power is really his poise and decision making. (along with being a legit 3-point sniper) The speed and athleticism concerns are legitimate, but he uses his body really effectively to wall off defenders. As he gets stronger, he will continue to improve his ability to finish at the rim and defend. At minimum he will carve out a role as a facilitator and floor spacer, but if everything comes together, he could be a star. I wouldn't ever bet against him...
Will's length and athletic profile can't be taught. The game seems to be slowing down for him, he is a threat at all 3 levels, and his off-the dribble bag is special. The sky is the limit.