Johnny Ive would be the best candidate. Apple is such a "Charisma" oriented company that they can't risk losing Ive, Hell turning him loose is what saved Apple from the post Jobs days and largely creatives are the people that buy Apple's expensive toys the most. Ive is more Apple than Jobs is, because he could actually do a tech demo of Shake, or some Apple spawned 3D app and then just as easily speak to the average consumer about the cool new features of the next iPhone.
Save it. The face of the company is the person who sees the entire picture. Ivy's oversight of a variety of Design engineers [M.E., EE, ChemE,etc] gives him far more credit than a industrial design degree holder should ever have.