Winny,
It is a
fact Dowding rotated and
rested his squadrons.
It is not speculation or assumption, the squadrons were rotated and rested. It was very contraversial and that argument is covered in some detail in the official RAF History. I personally believe it was an essential part of the RAF victory.
Keep in mind that tactically, the RAF SE fighters took a pasting from the Luftwaffe SE fighters with the exception of July 1940. Very good pre-war planning, good leadership, most significantly brave men and women all allowed the RAF to increase its strength during the battle to ultimately prevail.
For the Luftwaffe, it is an example of tactical success ending in a defeat in the campaign.
