Alright, so thinking about it, I'm at least nailing some things down that probably don't matter but whatever.
So Josefumi Kujo is obviously the Josuke of this universe, but isn't the bastard son of Joseph Joestar this time and is instead the son of whoever the equivalent to Sadao Kujo is in this universe. And in this universe Karera (the Yukako equivalent) isn't in love with Yasuho (the Koichi equivalent) but Josefumi. His stand is the bubble stand (evidenced by him taking the pepper that got spilled on his ramen in the latest chapter and depositing it on the counter) and I guess because he's not in the Joestar family tree this means he doesn't get Crazy Diamond, while Kira gets to retain Killer Queen because his father isn't a different person. Without a doubt he is now fused with Kira and became Gappy.