The Golden Knights are the most awesome bunch of jumpers there is.
That being said, jumping out perfectly good running airplanes thousands and thousands of times until it becomes “routine” has got to catch up with you.
I remember an incident in the early 90s in which a very experienced skydiver had jumped with students a few times already that day. He forgot to put on his parachute. Filmed with his helmet cam all the way to the ground.