Nah, I'm just here for the virtual tiddies
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I'm not sure if I understand correctly, but:
-We know about the room's significance from almost the beginning (Episode 2 IIRC?). When drunk MC tries to open it, it definitely makes Bella anxious. After ruining the Prep party, MC 'knocks on the wood', which happens to be the locked room and Bella is again seen a bit agitated.
-The reveal is shocking to not only MC and Maya, but also Bella - that's the last frame we see in E11. I don't think she would react in that way to the painting, that's being gifted by other LI.
I'll agree that those the commonalities justifty the theory, although I think that might be a red herring. We still have a long time to exchange theories, unless DPC pulls out an early release surprise