My list of concerns:
Offensive line. I'll have to go back and look, but I remember several instances where we were beat on a single block that blew up otherwise well executed plays.
Defense. Inability to step up in crucial situations. NDSU was something like 11-18 on third down. We miss a lot of guys, but honestly about a dozen plays I thought "Arthur would've made that tackle". So yeah, stars matter, even if you only have a few high star guys.
Playmaker at RB. Hubert isn't awful, but clearly he needs to be the secondary guy. With an offense led by waters and no dominant offensive line he may not get 500 yards this year.
Very early returns are showing I could be wrong on not thinking this is Ell vs Dunn 2.