alternatehistory.com

Droman said:

Bretwalda is just "Britain-Ruler", though. It just signifies the most preeminent king or lord among the Angles, Jutes and Saxons of the British Isles, like the Britons had the King of the Britons and later Prince of Wales, the Irish their High King and the Scottish their own High King.

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I suppose. I guess i was just trying to emphasize that the English kingdoms are still technically independent, as they all have their own kings, who are subordinate to the King of the Brythons.
Whereas the Brythons only have one king, with lesser princes under him ruling various clans/tribes/areas.