How did lions find out that Lancelot was one of the knights of prophecy? I mean, when you talk about Percival it's pretty obvious, as there aren't many people in the world with green hair and the shape of wings. Tristan is also pretty obvious and Bartra must have figured it out as soon as she saw the prophecy that it was Tristan, so once he told the sins everyone should also know it was him. But Lancelot really isn't obvious, someone who doesn't have a fixed form, it could be several people, even Diane and King's children must have the power to change their appearance, the prophecy says nothing about Lancelot's magic, nothing to accuse or that hints at him being the formless knight, a strange point.