About the Integrity Knights, I wonder how many were those powerful warriors in the Integrity Knight Order, In Alicization Dividing, Kirito and Alice debated of their strength, allegedly believed to be powerful, if the Integrity Knights can stand their ground on their own against the Darkness Knights and the Darkness Arts users if the invaders from the Dark Territory attacked the Human World that even a goblin, weakest of them all, can give the likes of Kirito a hard time defeating it without the aid of an army of regular soldiers, knights and Sacred Art users.
It's true that Integrity Knights are fairly strong against a dozen or few opponents. Seen with Alice and few others but can they stand against an entire army?
By the way, the Integrity Knights kinda reminded me of the Holy Knights from The Seven Deadly Sins.