Why imagine that? There are lots of schools that use JUCO help effectively.I imagine the talent pool at JUCOs is not always very deep. If so, then all DM can do is take the best that is there to fill needs.
If you mean there may not be JUCOs in our region, or players who have an interest in SU, that is another story. My observation is that Marrone & staff have found JUCO help to add toughness and size and -- when they recognize some gaps (DL this season), they can pull from the West Coast (Jones & Pierce-Brewster; maybe Garrick if his knee recovers; Googins, Alexander for OT) or maybe downstate (Johnson who is pending NCAA clearance). Just don't seem to have much interest or success in supplementing with JUCO skill guys.
But I hope that Hunt is the real deal so we don't have issues if Nassib can't play every down.