There are many things that could be a major challenge for the Buffalo Bills in pursuit of ending their championship drought. For Jeffri Chadiha, it’s a clear and obvious one. The NFL columnist shared an article highlighting each team in the league’s “biggest challenge.” And while one could assume the James Cook contract saga or who will be MVP QB Josh Allen’s No. 1 target, Chadiha said it’s the defense being reliable “when it matters most.” ”The Bills have been championship contenders for each of the last five seasons,” said Chadiha about the five-time reigning AFC East champions. “But a similar theme annually seems to emerge: Their defense falls apart in the playoffs. That can’t be the case