What's the supporting data behind this?
Per https://www.reddit.com/r/buffalobills/comments/3nz1h8/rex_ryans_jets_penalties_per_game_20092014/
Rex Ryan coached teams:
2009 - 5.68 PPG - 20th in the NFL
2010 - 6.05 PPG - 15th in the NFL
2011 - 6.38 PPG - 15th in the NFL
2012 - 5.19 PPG - 29th in the NFL
2013 - 6.75 PPG - 10th in the NFL
2014 - 6.84 PPG - 16th in the NFL
Personal Fouls:
2009 - 2 (league avg 1.81)
2010 - 3 (league avg 1.81)
2011 - 1 (league avg 2.47)
2012 - 3 (league avg 2.59)
2013 - 3 (league avg 2.47)
2014 - 1 (league avg 2.03)
For comparison, here's the penalty rankings (ordered by least penalties as #1) of the super bowl winners in that time:
2009 - New Orleans (#8)
2010 - Green Bay (#3)
2011 - NYG (#11)
2012 - Baltimore (#27)
2013 - Seattle (#32)
2014 - New England (#25)
2015 - Denver (#16)
And here's Buffalo's rankings during that time period:
2009 - #25
2010 - #7
2011 - #8
2012 - #12
2013 - #25
2014 - #30
2015 - #32
In my opinion, what this data shows is:
In his career, before last year, Rex has been about average in penalties called against his teams.
Penalties doesn't seem to have much of an impact on who wins the Super Bowl.
Buffalo finished near the bottom of the league in the two years before Rex joined under Marrone, indicating this isn't a Rex Ryan created issue.
I personally don't understand how, when looking at all the data, we can say it's Rex's teams that are undisciplined. His teams are about average. It also seems to me it's the current Bills players who commit a lot of penalties and Rex inherited a "problem" (if you believe high penalty counts are an issue - I'm not convinced it has a major impact overall - it certainly in specific situations but I believe the data shows other factors are way more important).
Rex Ryan's defensive rankings in yards per game:
2005 - 5
2006 - 1
2007 - 6
2008 - 2
2009 - 1
2010 - 3
2011 - 5
2012 - 8
2013 - 11
2014 - 6
2015 - 19
What changed between the 2014 season and the 2015 season that all of a sudden caused a defensive scheme whose lowest finish ever, #11, to become a dinosaur?