The better question might be: "would 4 decent QB prospects actually sign with LSU?"
I don't see the Mettenberger commitment confirmed anywhere right now, but if that is true, I feel much better about Dak sticking with his commitment to us.
If you are a decent prospect, you don't want to be in a class with other decent QB prospects.
ETA: Just realized Mettenberger is a JUCO QB. That wouldn't factor in as much as I thought it would. If they pull in Bridgewater, than Dak definitely needs to steer clear of LSU.