This did come back!, from the urban guerrilla fight, mamezuku noticed that josuke's soap bubbles where spinning lines, and now what?????? what it's going to happen ??? i wanna know MORE!!!
OH SHIT SPIN IS BACK
I assumed some truly wacky shit would happen like the answer would involve like string theory to do some quantum bullshit to overcome calamity or something
Who knows maybe they'll do that
In the end of SBR, it was mentioned that the Zeppelis moved to another country after Gyro died, but no one knows for certain which country it was.
Maybe it was Japan?
Either Rai is a descendant of the Zeppelis or an ancestor of his learned it from Johnny.