I think there is presumption that ND will be in the FF because the past 2 years the consensus belief was the Notre Dame would take a step back (ranked out of top 5 each year) and then they surprised both times. When Peters, Novosel, and Mallory graduated (leaving only starters Diggins and McBride), ND was still strong. Achonwa really stepped up, Braker came out of no where to become a good, gritty starter, and freshman Loyd took the last starter spot (and won FOY). The next season, ND adapted to life without Diggins by taking an undefeated record into the NC game. Lindsey Allen "replaced" Diggins, and did a great job on offense and defense (considering she was a freshman PG). This year, ND has to replace 3 starters again, but the cupboard seems less bare this year, as Muffet has been recruiting very well these past 3 years. Reimer starts in place of Achonwa. She was no where near as good as Achonwa last season, but her numbers were better than Achonwa's freshman (or sophomore) numbers. Taya will have to develop, but many players make a HUGE leap their sophomore season (see, Stewart, Breanna, Jefferson, Moriah, and Loyd, Jewell). Loyd was a star last year. Allen played very well, and if she makes a sophomore leap, ND will be set at the point. McBride's spot will be filled by a combination of Cable and Mabrey. Michaela really improved her game last season, so she's probably ready to start at this point. The last starter ND has to replace is Braker. Brianna Turner is upgrade when you consider height, jumping ability, and offensive ability. The only things she lacks are Braker's savvy and grit. There will be rough patches starting a freshman, but Muffet has done it the last 2 seasons (Loyd, then Allen), and it's worked out just fine.
The reason why you only see one star at Notre Dame is because 3 starters graduated, leaving only a freshman PG and the aforementioned star (Loyd). Stars need minutes to show their stuff, and I'll bet that another starter or two shines given the opportunity.