Looking through that fumble data, I realized that he's doing offensive plays over total fumbles. The problem with that is that fumbles can also occur on kick-off/punt returns. This is not only a general problem, but it is concerning in this case because those plays wouldn't involve the Patriots' special ball, the players would be using a normal kicking ball.
So, I went through his data for each team over the last 5 years, and took out all of the fumbles that occurred on special teams, so we can look at just fumbles per offensive play, with each team using their quarterback's preferred ball. If you looked at at the original analysis, this was the ONLY metric (plays per fumble over the last 5 years) where the Patriots did not rank #1.
As you can see, 29 teams are grouped pretty closely, between 44.8 and 71.9 plays per fumble. The 3 teams at the end are New Orleans (80.7), Atlanta (91.5), and New England (101). Not only does New England lead the league, they are the only outdoor team in the top 3.