[abram]

It would be interesting to get the stats on fumbles during kickoff/punt returns (when a neutral kicking ball is in use, not a team-supplied offensive ball), and on plays involving interceptions or fumble recoveries (where they would be using the other team's ball). If they rank highly in fumble prevention in those situations, it would suggest that this is a result of coaching, not using a particular ball.

[fecak]

Kickoff and punt return fumbles can be the result of other factors - players traveling at high speed over a long distance hitting a returner looking skyward is a unique football situation that only occurs on returns.

Interceptions and recoveries would be by defensive players, who would spend much less time focusing on ball handling since they rarely carry the ball.