ESPN has a coaches poll on random topics throughout college football each week and this week's topic was most memorable plays. That includes all-time plays, not just in the last decade or so. That might explain why Auburn's Kick Six was somehow not the top play or even the top three!
Doug Flutie's Hail Mary against Miami in 1984 is pretty awesome, but that wasn't a rivalry game like the Iron Bowl or the California-Stanford game. But the coaches have spoken and it seems they like their old school, grainy video plays.