It's kinda part of the continuity they have between events. They have a Ninja Warrior-esque obstacle course. One year they bring in a group of super sentai sort of people for the event (obstacles, explosions, Japanese pop culture, kind of an easy mix) where the red/yellow/black ranger pose emotes came from. Now this seems to be building further off of that, since there must always be one ranger cooler than the others I guess.