Josh Allen and the Buffalo Bills (3-1) travel to Arrowhead Stadium for their first measuring stick contest of the 2021 NFL Season to face off with Patrick Mahomes and the Kansas City Chiefs (2-2) on Sunday Night Football. Buffalo still feels the sting from the last time they faced the Chiefs, which ended in a dreadful AFC Championship loss. After decimating their previous three opponents, the Bills hope to prove that their hot streak is no fluke and establish themselves as the top dogs in the NFL. Here are the five biggest storylines to follow in Week 5 of the 2021 NFL Season. Will Josh Allen rise to the occasion against poor Chiefs defense? The Kansas City defense that will take the field on Sunday night is far different from the one that harassed Josh Allen during their last contest. Kansas City has the NFL’s No. 31 ranked defense in terms of points, allowing 31.2 points per game while surrendering a whopping 437.7 yards per game. The Chiefs have been horrendous when it comes to defending both the run and the pass, and Allen will look to take advantage of a team with a subpar secondary and a defensive line…