With the addition of the 12th gimme game, the only fair way to compare records/season is losses per season. One win should not count as a factor.
And since you are comparing the Big 12 of today with the Big East of the 90s, if you look at end of the season rankings for the 90s, the Big East had almost identical percentages of top 25 teams as current Big 12. The Big 12 is a great conference but it's not any stronger than Nehlen's Big East. And since joining the Big 12, Dana took over an established program and has averaged more losses than Nehlen did having taken over a program without a solid win in four years.
In addition, to even compare what Dana has done for WVU in his first five years compared to what Don Nehlen did in his first five years at WVU is beyond ridiculous. They are not in the same league.