Each test pilot I know considers him, or herself, now that there are women, to be the very best. It's very demeaning to step down the ladder once in a while
When a test pilot comes off a flight, there is typically another pilot who is going to take it up, and he believes in the debriefing. You don't keep something to yourself
Apollo was just too big, like flying a big transport airplane, which fighter pilots don't really revere. Gemini was just about the right size.