I'm assuming this spot on the D is a bit of a movable feast in terms of where he lines up. Listening to Pot Roast, it seems they are looking at several guys who can either line of on the DLine proper or in a 2 point stance.
I thought 'jack position' is what many here assume when an NFL owner and/or state-sponsored media rep is about to make a statement
Or Robert Kraft waiting for his massage.Or how a person gets set up when they are about to watch some porn.