I wonder what those same stats would be for the 30 years before the past 15. I am suspecting, despite the 'high risk' (fumble prone supposedly) offenses of Osborne and Solich running options, etc., that we may well have been a net positive team in turnover margin. Losing the turnover battle is a very strong indicator of a losing outcome.
Teams that throw the ball alot get INTs typically and sack/fumbles while wishbone and option running squads tend to get more fumbles from bad handoffs/pitches, etc.
I am not sure whether one or another type of offense is actually more turnover prone. No doubt somebody has looked at historic numbers. It is more about individual players than about schemes perhaps.
This is so glaring, I am surprised it hasn't been the focus of much more discussion and analysis. Perhaps the past 15 years have not been all about the poor coaching and lack of talent as much as having players that are not aggressive and or alert enough on defense to create and collect turnvovers while our offenses have been sloppy and mishandling the ball too much.
I realize those are things coaches are responsbile for as well but fumbling and not catching the INT balls is mostly a function of player failure.
No doubt Huskers have made life a lot more difficult with effectively one arm tied behind our back just to make it fair!