Like many coaches, Geno will experiment with different lineups and substitution patterns during the season. In addition to last season's top six players, Geno also played MW, Mikayla, AEH, Molly & Kyla meaningful minutes off the bench at one time or another. In fact, the only 2 players that were relegated to mop up minutes only were Batouly & Lexi.
The way I look at the original question relative to Geno's rotation has more to do with who he trusts in those BIG GAMES vs ranked opponents in season, and then again once the Huskies get to the Big Dance in March. I would love for that total to be 8 or more players, but historically it's less.