Yes, Johnson kept McFadden and Jones clean … he was missed after he left. Allen’s approach was described as selling out to stop the run. The DT talent at PSU may keep Allen employed there a long time.I don't think it has anything to do with figuring it out and everything to do with personnel and coaching/recruiting.
We had some studs on the Dline in Allen's first few years here. I think our recruiting dropped off in that area and our Defense wasn't the same after Wommack left.