[Glider]

I think we agree on most things.

There is a difference between skill and experience on that I think we agree. It is quite possible to have a lot of experience on an aircraft but still not be skilled enough to takie it to the limit. It is also possible to be very skilled and not a lot of experience in an aircraft.

The Me109 was flown by an RAE pilot who we can assume is a very skilled pilot used to flying a variety of different types of aircraft. As you say he wouldn't have been given the job without that extra something. Test flying is by definition the art of taking the plane to the limit, to push the envelope to see what it does.
You are correct, we don't know how many hours he had on the Me109 but that is of lesser important than his experience as a test pilot.
From the test we know that he was confident to fly the Me 109 past the deployment of the slats which is something a number of German pilots didn't do. We know that from other quotes from other german pilots. We also know that he flew it past the stall in a tight turn until he had to recover it which means that he did push the envelope until the plane stalled.
The intresting thing is the combat with the RAF pilots. Some clearly did fly their aircraft until the shudder and those did turn inside the Me109 whatever the 109 pilot did, even until the Me109 stalled. However, others didn't and they found the Me109 when flown to the limit, stayed with them.
Those RAF would have been experienced but the skill level differed. I say they would have been experienced because if a Sqdn Leader was asked to send some pilots to fly mock dogfights against an Me109, I am willing to bet a pound to a penny they would go themselves and say the flight leaders. They wouldn't send someone inexperienced

|I know my experience was in gliders but I flew a number of different types and it didn't take that long to get the hang of something. The only real issues were if the glider had a new feature which I had no experience in, how to use that feature took a little time but you got there within a few days, not weeks.

Edit - I should add that using the new feature was fairly easy, getting the bewst use of it was something else. In my case it was when I started to fly high performance gliders with water ballast. Using it was easy, knowing when to use it was tricky