Paraphrasing another comment I read sometime ago: Gwynne is very capable of managing the operations, but would SpaceX really be landing rockets on drone ships if it wasn't Elon pushing for it?
Elon has always been one of the main drivers of innovation over there, Gwenn has been the one keeping stuff afloat but Elon has been the one driving the "the hell I'm paying that much for a piece, I'll make it myself" culture as well as the iterative process.
