Gonna put on my tin foil hat and throw in some wild speculation here (and wishful thinking):
I‘m sure theming this to Joker was the original plan....but what if they decided to save the Joker theme for a Riddler colorless train conversion? I mean the supports are already yellow, so all you would have to do is do a paint job on the track, instal the losing system from Scream as well as the train, do a light retheme of the station to Joker, and viola! You have a new coaster to market. Oh, and they can just transfer the stand up trains to Scream. Give that a new name and you can market two new coasters for 2023.