The biggest question facing the Kansas City Chiefs as they resume their quest to become the first team ever to win three consecutive Super Bowls is whether 3 1/2 weeks' rest will result in too much rust.

There’s a difference between ‘I think I can’ and ‘I know I can.’ The Chiefs more than any other team in the NFL have the ‘I know I can.’”

The Lions and Chiefs are in a tier of their own odds-wise, thanks to their 15-win seasons and accordant first-round byes. But both have nagging concerns that, if you squint hard enough, begin to look a lot like vulnerabilities. Will any of their potential opponents through the postseason be able to capitalize on those vulnerabilities?