I don't think Einstein was a tweaker. His theories came completely out of left field.
Its easy to take shots at someone after the fact, the reality is that maybe he wasn't everything people thought he was. He might not have been a sweetheart to work with, in fact he may have been a jerk. But, lets not kid ourselves into believing he didn't do that much and was just some tweaker at Apple, I call BS. Apple was basically dead when he returned, dead. It must have been a little more than tweaking to make it the most successful company in the world.