It's already been a tough college football run for the SEC . After watching the Big Ten claim the last three College Football Playoffs, the SEC might even be slipping in the world of mascots. In a recent ranking of top college football costumed mascots, the SEC came up missing-- completely missing. SEC Mascot Shutout A panel of pickers from On3 recent pondered the mascot world and set a pair of important ground rules-- no human mascots could be considered (which would knock out, say, Tennessee's Davy Crockett mascot) and neither would live animals (thus omitting Georgia's series of UGA live bulldogs). But even with those limitations, the SEC's disappearance from the top of the mascot game was more than a bit surprising. Top Mascot Picks The three-man panel from On3 didn't pick any SEC mascots in their top five picks. The three top picks chosen were Western Kentucky's Big Red, Oregon's Duck, and Sparty of Michigan State. It's an interesting group.…