re: Actual football question, offensive line rotation.

I think its all been about covered. Two thoughts I agree with most:
-cohesion on the OL needs continuity and trust that comes from reps playing together. OL is a unit that must play in unison to be effective. Plug and play would be disruptive.
-offense always have the advantage as they know where the play is going, using less energy than the Ds who are in reaction/disruption mode.