Elon Musk is in the rare position of being CEO of two public companies. Bloomberg/Getty Images; Zhang Peng/LightRocket via Getty Images SpaceX president Gwynne Shotwell didn't rule out a mega-merger with Tesla. "That might make Elon's life a little easier, actually," Shotwell told CNBC. Analysts have speculated that Elon Musk could combine his two public companies after SpaceX's IPO. The noise around a Tesla-SpaceX mega-merger is growing louder. In an interview with CNBC aired Friday, SpaceX p