In the first episode, the first time we see Fish Mooney, she is watching a stand-up comedian try out at her club. He tells a blackly humorous joke and she loves it. Then some violence occurs that he witnesses and he gets scared. Right off the bat I thought it would be him, so when I saw Jerome's first episode I thought they must have changed their minds. Now that we know that Jerome was a little misdirection, I think once again that it is the comedian from Ep 1.
I still will hold out hope for Jerome, until proven wrong, as think Gotham NEVER wanted him to keep coming back, but when they resurrected him, they just might fimnd that Jerome as Joker is what they have to do!