User blog comment:Xmortal/Inazuma Eleven Go Chrono Stone planned from the beginning of Inazuma Eleven Go?/@comment-3153924-20130508022112

For you're question if Chrono Stone was planned before GO, then it's a yes. For the rainbows, it's just a motif. For the wormhole, are you talking about the wormhole created by Saru or the wormhole in the opening's? Eitherway, a wormhole is not a place, but is known to be a way to go to other timelines, hence it is used by the CS team to timetravel to other areas.