Happens more than you may want to admit. Appy State and Michigan. Navy and Notre Dame in '08 or '07. Temple and Virginia Tech in the late-90s. Stanford and USC when the Trojans were studs. In the majority of situations, sure, but if there is a chance for a team of lesser talent to win, it's not trick plays or even just turnovers. It's a day where every offensive line assignment is nailed, every defensive lane and coverage assignment is nailed, etc. In general, you want the talent to be at least nearly equal, but for most teams in a power 5 conference, the talent disparity is not extreme, it's the execution and maximization of that talent. A quick for instance...Seth Green was fairly touted as a HS QB. He was obviously misfit as an every down quarterback, but the team has used his ability to run an offense in their "Green Wave" package and in other packages on the field in different positions. Maximizing a player's talent, rather than forcing a square peg in a round hole or tossing said peg aside when it doesn't fit, is a huge thing that Fleck does that's not been done well recently.