The article above doesn't say much but Beaver is right about the half who gets the gig having to be the controller of the play.
Having Blake Green erased the memories somewhat of the prior year where the opposition targeted DCE, repeat sets were rarer than a half full house at a Sydney NRL stadium, and quite often the fifth tackle play ended up with Lewis Brown, who despite trying his best, shouldn't have been put in that position.
If Hastings is the only "specialist five-eighth" in the senior squad then he has to be considered first in line you would think.