There's something in the idea of Rey Mysterio announcing his Wrestlemania in-ring return in a vignette on the program that would be terrific fun. Having last appeared in WWE in April 2014, the idea of Mysterio returning and being a "Team Angle"-type mentor to Kalisto and Sin Cara would be cool. Mysterio being built up to the point where he could challenge a WWE Champion Seth Rollins to a title vs. career match at say, Summerslam would be fun, too. Rey being kept around in WWE as a manager for the duo (if they don't make Kalisto a gay hairdresser first) keeps him around, and also may allow for the lucha legend to extend his legacy.