*mild BBSFM spoilers* I'll admit, this is a little weird. But I have a theory that the boss of BBSFM's Secret Episode is the Heartless of Lady Tremaine and the evil step-sisters. In Aqua's visit to Castle of Dreams, Cinderella's step-family apparently summoned an unversed to kill Cinderella, out of jealousy. It ultimately destroys them, and Aqua comments "The darkness in their hearts overtook them", which is a pretty accurate description of how a heartless is born. In the final phase of the battle, the Dark Hide creates three copies of itself, each one colored differently: one red-ish pink, one green, and one purple. These are the same colors as the three ladies' dresses. And after the battle, Aqua emerges into the Castle of Dreams world, now lost to darkness, in the same area that the three of them presumably died. More than likely I'm reading too much into it, but I thought it was an interesting set of coincidences.