The thing with USF is would their strength of schedule carry them to the le game? They so far have beaten a #5 and #17 (at the time) and currently only have one ranked opponent left (#15 Cincinnati).
Undefeated Cal has beaten the #15 and a #11 and has the #14 and #10 left on their schedule.
Undefeated Ohio State has beaten a #23 and has the #18 and #19 left.
Undefeated BC has beaten a #15 and has the #12 and #21 left.
OU has beaten the #19 and has #11 Missouri this Saturday.
USC has beaten a #14 and has the #2, #9, and #14 left. Though their sole loss was markedly worse than OU's.
If Cal goes undefeated the rest of the way I don't see USF, Ohio St, or BC jumping them.