The Kansas City Chiefs are undefeated in the last 11 games, but the team’s wild-card victory last weekend was its first postseason win since 1993. The New England Patriots, on the other hand, have won a total of 21 playoffs games under the tandem teamwork of coach Bill Belichick and quarterback Tom Brady – and that’s just to date. In this showdown, the Patriots might well end the Chiefs’ streak, which would be deflating. But at this point in the season, how much deflating