Kansas City held Arizona to under 300 yards — and the Cardinals scored just seven points through three quarters of play. The Kansas City Chiefs completely dominated their Week 1 game against the Arizona Cardinals, winning by a 23-point margin. As quarterback Patrick Mahomes threw for five touchdowns (and the offense exploded for 44 points), the defense held the Cardinals to just 282 yards, seemingly — at least through one game — getting out to a better start than it did a season ago. The Chiefs allowed just 282 yards today Their season-best last year was 276. Cardinals surpassed that…