I remember Holtz running a lot of full house

I think that he did have the wishbone in there and ran that against teams in 86 and 87, but I'm not positive.

He could always find the bubble--his whole running game philosophy boiled down to (basically) the defense having to have an odd number of guys to one side (5) and that if he could find a way to run to that bubble he could consistently get yards. The full house/double tight is the best way to force them to tip their hand and it gives you possibly two lead blockers out of the backfield (assuming no fake).