So, if Xykon said "I love you, Redcloak", it'd be true because you claim that Xykon is the one who really should know if that truth or not and if he said it, it must be true?
You'd seriously claim that? Because right now, you claim right the same type of answer and consider Eugene being a source of truth about Roy's level.

I do not discredit Eugene's statement because "he could have been lying" but because he, as source himself, is highly unreliable.