Here's some food for thought
Spoilers for all the manga partsSo you know how Pucci reset the universe so everyone knew their fate
Well what if all universes and counterparts had a similar fate
Like this
Gyro is the counterpart to William zeppili teacher of Hamon to Jonathan
While Gyro is the teacher of spin to johnny
Near the end of their journey, after he completes Jonathan training, Baron Zeppili Gets Killed
So does Gyro
Jonathan survives a bit after that then dies by fire/getting his head cut off to save Erina
Johnny survives a bit longer then gets his head crushed by a rock after sacrificing himself for his family
and to end this off think of Jouske he is a mixture of Kira and Josifumi after kira dies in part 4 he losses all memory after Kiras dead body and Josifumi fuse they Josuke has no memory
Anyway that's it byyye