I think you missed the point of my post. The "trend" is meaningless, but if getting a #1 seed gives you a 50% chance of getting to the Superbowl then obviously it's advantageous if you want to win it. If you are in the SB that means you've played at least two straight weeks and then a weekend off, I find it hard to take it on faith that without any statistically significant evidence somehow not having played a game a month before is a disadvantage.
Also - 2 out of 7 SB winning teams have had a bye and won. That's about 29% of the time in the last 7 years a bye team has won. Considering teams with a bye (4 a year) are only 33% of all playoff teams (12 a year) then even if we were to ignore variance getting a bye would be at worst a 4% disadvantage. If only 1 more bye team had won, say Gronk doesn't get injured last year or Samuel makes that INT, then that would be 3 out of 7 or 43%, a full 10% advantage in winning the SB if you get a bye. So really Your assumption only hinges on 1 of those 7 games going differently than it did.
Edit - if you extend the sample to ten years, 5 of 10 have been won by teams with byes. Taking a 7 game sample where the the average drops from 50% to 29% is frivolous, you'll find that flipping a coin and getting heads 5 out of 7 times is far from a notable event.