analytics and other newer metrics make it possible to look at it in a myriad of ways.
Utah's D is giving up the least amount of YPG, which is saying a lot given their offense has struggled to maintain TOP and drives in their last four games. BYUs D is more efficient in when measured by offensive success rate against it and obviously causes more turnovers. Points given up per game are very close.
Iowa State's D might be better than both the Utah and BYU Ds.