Yeah as much as I think Zacha belongs in any list of top-50 prospects, you can't deny that almost every forward on that list is having a more impressive season than him. Rantanen in particular, I don't know how you can fault that decision. Rantanen has more points per game in the AHL than Zacha has in juniors. That's incredibly impressive for a 19yo.
The guys I really don't think should be on that list are Senshyn and Hartman. Dickinson's another guy I'm not too keen on, but as a generally productive forward in the AHL, I can see why he'd get a nod.