Sure, but I'm not sold that the correlation is causation here. The only analysis I've conducted showed that the 2010 Patriots had a very tough schedule and they demolished some of the best teams in the league on the way to 14-2. They didn't seem like they were out of gas like the 2007 team.
I would have to take your word for it. I've never seen any facts or study to back it up or refute it. All I know is that the one time I looked at it, the correlation didn't hold up.
So I did a little digging and looked at strength of schedule. I don't like this as much as my 2010 analysis where I assessed the record of the team at the time the Pats faced them because it's important to factor that in as well, since teams become better or worse as the season progresses. Anyway, this will do for a quick look. I put the rank out of 32 is in parentheses.
*Note: This is based on the strength of schedule as it comes out the next season; for example the 2015 numbers reflect the 2016 "strength of schedule" where they use the final record of the 2015 season.
2015 - Denver (14), Carolina (12)
2014 - New England (22), Seattle (4)
2013 - Seattle (6), Denver (2)
2012 - Baltimore (5), San Francisco (9)
2011 - NY Giants (1), New England (32)
2010 - Green Bay (13), Pittsburgh (27)
2009 - New Orleans (27), Indianapolis (11)
2008 - Pittsburgh Steelers (29), Arizona (27)
2007 - NY Giants (15), New England (32)
2006 - Indianapolis (5), Chicago (31)
2005 - Pittsburgh (7), Seattle (29)
So we see a few things here.
Average SB winners strength of schedule: 13th in the league
Average SB losers strength of schedule: 20th in the league
Some takeaways:
- Five times the team with the weaker schedule beat the team with the stronger schedule, but interestingly, that's happened in each of the last three Super Bowls.
- New England managed to reach the Super Bowl twice despite having the easiest schedule, though they lost both times.
- New England (2014) is one of only three Champions since 2005 to have a strength of schedule in the lower third of the league.
Overall, I see a correlation between teams with stronger schedules beating teams with weaker schedules in the big game, but when we factor in just getting to the Super Bowl, the average strength of schedule is 16th in the league; rather pedestrian.
I realize that it's only a SOS comparison and it only goes back to 2005, but I'm too lazy to dig deeper. I just wanted to see what the numbers say.