You can take that “any given Sunday” bromide and toss it out with some of Case Keenum’s interceptions. So far in 2019, there is a Grand Canyon of separation between the contenders and everybody else. Sure, there will be upsets — or what we conclude are upsets until we learn more about the 32 teams. No, the Dolphins aren’t likely to pull off one of those anytime soon, and the NFL’s bottom teams…