I just finished P1 and I haven't seen any theories minus "there is no rogue card" SO
CRACK THEORY TIME:
My initial crack theory was that there IS a rogue, and he swapped his card with someone else's after realising they were blank so that they wouldn't know to come forward about it. This was either to prevent double-crossing, or simply to be able to take control of the game without the Game Master noticing that the cards were different.
My second crack theory that sorta adds onto this is that there IS a rogue, but the rogue swapped his card with MC's. I bet he did this in order to ensure her safety no matter what happens, and if they succeed in filling the vase, the rogue, who now has the Goddess card, chooses MC, who has the Rogue card, and she gets to go free while the rest of them can fend for themselves inside.
Or otherwise, MC has a suitor card, and whoever is switching cards is going to play this switch-up to their advantage somehow.
No matter what, there is no reason for the Goddess card to go blank both for plot shenanigans and/or the fact that it probably isn't, it's just that one of the guys (probably the rogue) switched her card with another.






