Shift again. It becomes confusing and unproductive, doesn't it? The same thing would happen to the mythological Rockstar Virtual Assistant as well. It would be easier for you to hire 2 people instead of just one -- for example, hire a VA to handle administrative tasks and another VA to handle marketing. Each VA would work in their specific Zone of Genius and make life easier for all. Outsourcing -- allows you to stay focused on your Zone of Genius.
For more about outsourcing and Zone of Genius, watch the video "The Myth of a Rockstar Virtual Assistant."