Not many D-1 programs have had undefeated regular seasons. There have been nine undefeated national champions: UConn six times (1995, 2002, 2009, 2010, 2014, 2016), Texas (1986), Tennessee (1998), Baylor (2012). South Carolina went undefeated in the regular season last year. As best I can tell no PAC-12 team has ever finished undefeated in regular season. Stanford went undefeated in PAC-12 conference play eight times (1989, 1996, 1997, 2002, 2010, 2011, 2012, 2022); Oregon finished conference play undefeated three times (1979, 1980, 1982) and USC went undefeated once (1986).
But agree the PAC-12 has many strong teams as evidenced by Colorado’s and USC’s wins yesterday. Unlikely any team emerges undefeated in conference play.