Yes, here’s a mathematical way to think about it. Let’s say every game is 50/50. The 1 seed has a 25% chance to make the Super Bowl, whereas the other six teams in a conference have 12.5% chance. This is without adjusting for the extra week of rest and home field advantage. So before even adjusting for those additional benefits, the 1 seed is twice as likely to make the Super Bowl than any other given team.