It doesn't have to be completely rigged to have the outcomes influenced, you need a good QB like Brady or Mahomes and a good all around team. I don't believe it's completely rigged, but very much influenced. Andy Reid couldn't get it done with his old QB, can't remember his name now, but with Mahomes it's all going his way and isn't going to change even though the rules do each year in favour of the athletic QBs. I don't follow the NFL much anymore, but I do occasionally see highlights where Mahomes seems to have a chance to win the game in the end every week. Then when he makes the playoffs his chances go way up. The rules are subjective, wheres theres subjectivity, there is opportunity for swaying outcomes.