I think Huberdeau will be the best from that group, but I thing he'll do it as a first line winger.
Galchenyuk is the one I believe will be the most likely to be a number one center.
Strome I see more as a high end #2 center, and with Tavares being on the Islanders, there's no way Strome moves up to first line center duty. Also wouldn't be surprised to see him used on the wing in the NHL.
Much like Strome, I see Scheifele as a high end #2 center. With Strome and Scheifele they could be first line centers, but it's determine by what team they are on and who else is on their team when they hit their stride.