Just the other day I was reading on Allen and Morse working together, and one stated that they were focusing on the simple nuances, such as pre-snap, hand placement; the QB and C usually develop chemistry, you'd probably be disrupting it unnecessarily if your idea was incorporated and applied throughout an entire game.
I think McDermott simply seeks O-line versatility, for the sake of being able to plug in quality players, in the event of an injury along the O-line --- not for innovation.