Nah Shane, one 20 grand bet would not have halved the odds, their is a lot of money floating around from punters early on for the flag as people try to get the best odds they can for their team or teams they think can win it. Lots of factors make up the setting of odds - recruiting, available players, players returning from injury, the number of bets placed etc. Its like horse racing bro, a horses odds can shorten simply based on track conditions and weather with out an additional bet having been placed.