re: What advantage, if any, is having rotating QBs

With similar skill-sets it should not be that predictable at first; not until a few games where play-calling patterns can be studied. Both can run and both can make every throw according to the coaches. We'll see. There is one huge, obvious advantage to the dual QB's. If an injury occurs, you've got someone coming in who's already geared into the game-plan rather than a sub who wasn't expecting to see meaningful p.t.