Nononooo. Megaman Wikia is a nono. confide in us.
Big 4's origins are shady, supposedly made for environmental cleanup, but they were used for war instead. its weird.
Its not clear if they know Copy X is a copy, but even if they do, its most likely they dont care, because copy or not, he is still X, and they are sworn to him. they follow both X, and Copy X, depending on which one's around.