I'm not sure you can read into these three you linked.

Josh Ensign left to become COO at a different company and his stint at Tesla was the longest in his list of experience: https://www.linkedin.com/in/josh-ensign-3604431/

Greg Reichow worked at Tesla for 5.5 years and switched jobs to become an investor: https://www.linkedin.com/in/gregreichow/

Kurt Kelty was at Panasonic for 14 years and Tesla for 11.5. As far as we know from LinkedIn he hasn't got a new job, which you could see as fine (left for personal reasons or simply burnt out) or bad (left because he saw doom ahead, even though he didn't have another job lined up). https://www.linkedin.com/in/kurt-kelty-5604bb/

What is so bad about these departures? Simply the timing?