RUMOR - Joker's stage in Smash Bros. Ultimate may be Mementos

Dataminers continue to pour through the source code for Smash Bros. Ultimate, and yet another breadcrumb has been discovered. In one portion of the source code, dataminer Dr. HyperCake found mention of Jack_Menentoes_. This mention was found in the same area where other series/stage references are made in the game data. For those who don't know, Mementos is a stage found in Persona 5. It doesn't take much to connect the dots here, which all seem to point to Mementos being the stage for Joker in Smash Bros. Ultimate.