I don't think I've even heard of anyone even saying the Vikes can cover 5.5
The bettors have already spoken, and they've said they doubt the Patriots can cover 7.5, major betting on the Vikes pushed the line down to 5.5.
The bettors had a few good weeks earlier in the season, my guess is Vegas is catching up, meaning lately bettors are doing poorly, the game is more likely to go against the bettors.
Expect the Patriots to get off to a quick start, refs should favor them in a big way early, taking the aggression away from the Vikes defense with offsides calls and hands to the face on DL, and holding calls or PI on the Vikes 2ndary. At the same time, they will call Ricky tack holding calls on Vikes OL, to take away the Vikes run game early.
SKOL to the BOWL !!!