On Dec. 29, 1957, the Detroit Lions were undisputedly the best team in the NFL. They won their last championship that day. That was also the end of Jim Brown's rookie season, nine years before the first Super Bowl and a little less than 12 years before man first walked on the moon.
Since that day, it's arguable that the Lions haven't spent a single week as the NFL's best team. That's changing. Choosing any other team as the best in football at roughly the midseason point when the Kansas City Chiefs have yet to lose is a good way to feel dumb later.