Tuttle is clearly going to be a very important player for this side. That's not a bad thing in general, it's probably a good thing in fact given how well he's being rated, particularly by the QRU, who made him captain of Queensland Country and prefer him over Gale for the reserve halfback spot at the Reds, which spells future Wallaby.
The fact that he's so far ahead of his contemporaries (particularly if the rest of them are below average, which if Sorovi is the best of the rest, they clearly are) is only bad for the JRWC itself.
Otherwise, having at least 5 best XV players (Tuttle, Magnay, Mafi, Tui and Tuipulotu) still to come into the starting lineup is good for the tourney itself. Is Harry Hutchison a chance of playing as well? There certainly wouldn't be many age Grade teams that would be performing at their best without 5 or so of their strongest side.
We'd certainly go from a middle teir side to a bottom tier side if you took out Fagerson, Cummings, Ritchie, Hastings and Kinghorn, even as good as a couple of the other boys are.