The fact that his "loyalty" didn't change after seeing Lucia means he's fake right? Or at least that's what I'm getting.
I think it's because he met Leticia's mother (his saintess) while she was a temporary saintess.
He's not fake, but I guess his allegiance won't change if he already had a saintess. He's just not the current saintess' wing.
If my guess is right, then Noelle must have met Leticia's mother after she had her baby, thus after she lost her temporary saintess title.
I honestly dislike both but at least the prince apologized lol. As for the assault if it's the Duke and he's end game arghh