Well, we DID play against 4 of the Sooner's 7 Heisman winners:I would say the 4 Sooners while we were in the Big 8/12, Sanders at OK state, the Buffs winner in 94. That is 6. I will guess we played 2 more in bowl games — so 8.
Billy Vessels 1952
Steve Owens 1969
Billy Sims 1978
Sam Bradford 2008
and
Oklahoma St's Barry Sanders in 1988
and
Colorado's Rashaan Salaam in 1994
but
your guess of 8, overall, is still coming up short...