And another thing, how do you judge Gildas' hagiography?

Gildas was contemporary with Arthur, he occasional mentioned Aurelius, Arthur's uncle, but he never mentioned Arthur himself.

Vita resolves the paradox because Gildas' brother was a pirate king hanged by Arthur so Gildas burnt all the pro-Arthur books.

I am a squeeing Arthur fan-boy, I want to believe the Vita. But it was written centuries later.