So, ShatterVictim(or something similar to that) is almost certainly true at this point, right?

It already had a lot of evidence going for it, and it's already heavily implied BV's soul is in pieces in one way or another.

But since the series has pushed heavily for CassidyReceiver lately, i quite literally am not aware of any other way you can explain BV's connection to the MCI and the Happiest Day minigames.