Why are you so eager to besmirch TO’s legacy? Please list the number of teams that regularly beat top 10 teams from 1973 - 1978. If there is a list, it will be very short because top 10 teams don’t lose very often.
Before beating Oklahoma for the first time in 1978, TO beat #2/4 Alabama and Bear Bryant in 1977. And while not top 10 teams, here is a list of top 20 teams TO beat prior to 1978:
1973: #12 UCLA, #16 NC State, #18 Kansas, #14 Texas
1974: #15 Florida
1975: #16 Colorado
1976: #14 Oklahoma State, #16 Colorado, # 13 Texas Tech
1977: #17 North Carolina