k9kiwi:
Bader OTL may have benefitted in tight turns - with his lack of legs, but that doesn't deminish his skills before the accident.
You don't get to be in the Hendon Air Display if you are just an average pilot!
Bader was not shy in 'blowing his own trumpet' he was good in the air, he was, I believe, a good rugby player, with his peers he was good company. People above him, may want to associate with him so that so of his popularity rub off! And so he rises - its not what you know, but who you know.
True in a peacetime RAF the availability of promotion may be low, but you are forgetting the large expansion of the RAF that went on mid to late thirties. And besides, there were opportunities for 'active service' in the Middle-East.
IOTL he was faced with a culture-shock when he re-joined, new aircraft, and also new methods of Command Control - only the former he really understood!
Perhaps, in this situation, he as an 'old hand' might have been instrumental in amending the restrictive 'Fighting Area Attacks'!