We know that the left-for-dead Eduardo’s transformation was put into play by Jaime Murray’s Agent Walker, whose mysterious existence will likely get a bombshell reveal/explanation in that episode.
Second, the episode summary confirms that there is an overarching “mastermind” behind much of the madness keeping Gotham City on its knees.
Many of us would love to believe that Jeremiah is doing it, but that’s likely not the case.
Could she be Gotham’s version of the Suicide Squad director Amanda Waller?
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The Masked Singer Mystery: Our Best Guesses (Part 4)