Tesla has started doubling down on its development of self-driving car technology, which means the loss of one of its top experts in the field couldn’t have come at a worse time. To make matters even worse, the expert, Robert Rose, has joined up with Google, presumably to help the company develop its own self-driving cars. Rose spent more than five years at SpaceX, and worked with Tesla for six months during the launch of Autopilot and Autosteer, so his decision to switch to a different company is definitely a major loss for Tesla, and a major win for Google.