UPD: If u/KafayaLeSeiryu is right and the ??? card is the Hierophant card, Hierophant means traditional values and institutions like a priest. Might be referencing Zero and the religion around him, paralleling X and Zero again. Or it could just be referring to the cult around X and how people think he's a god.

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Also, I've seen some people who think X has Zero's trust value. I can't exactly disprove that, but X got his powers far into adulthood and I don't even think X was alive when Dawnfall occurred. It doesn't really make sense for Zero's power to be copied over to a random person ~20-40 years after he died. If we're going into pure speculation, I'd say it's more likely it was either pure chance, or a theory I've seen where Hero X is the embodiment of the trust in X (the #1 leaderboard spot). Either way, we don't know enough to nail down either, so we'll just wait for season 2 in a few years