Well first I don't buy that part, but I'll put that aside.
Specifically QB, RB, DE, WR. Those are the game changer positions that the gap between 4 and 5 stars are clear, development aside. Saquan Barkley...who else in those roles of merit has been at Penn State? Michigan at least can point to ONE 5 at those roles under Harbaugh and many 4s. OSU can for many 5s.
Name one good QB Penn state has had in their entire room since Franklin? One that could start at michigan, OSU? They're trying to win that division with Wisconsin and Minnesota caliber QBs.
The difference for xs and os is that Franklin doesn't put those star LBs and those rare 4s he gets in a position to win, or develop them. Harbaugh does, Day MIGHT but I don't think his development is proven yet and his teams get bullied in the trenches...but that's another topic
To land the plane; if TN starts getting the elite recruits in the positions I listed they could take over the division
. And unlike Auburn or ole miss, I think they have the resources fanbase and drive to do it.