Bama's OL, Nick Saban and Michael Jordan

If you watch enough college football, you'll see that many offensive plays, which provide pass protection for as long as Bama's OL usually does, result in a holding penalty. Although Bama has a very good OL, they rarely get called for a holding penalty, even when the pass protection is for an extended time. What's the reason for this? Has Saban developed such an aura of greatness that the refs are less inclined to penalize his teams? If so, this is what happened when Michael Jordan was at the pinnacle of his career because charging and other offensive type penalties were rarely called against him.