Which rule is more powerful when there's a conflict? If we take those "Clark and Bruce happen to meet once as children" stories into consideration, does Claire become a childhood friend and therefore loses the regular protection of being the first girl? Or maybe she's more of a forgotten childhood friend and still counts as a first girl?
Or maybe everything actually runs on otome logic instead, with Claire as the protagonist. She works, as a nerdy girl with secret strength and beauty nobody knows about and whose primary love interest is kind of an asshole sometimes.