Board Thread:Manga Discussion/@comment-43843630-20191005174541

The head doctor is the first norisuke from steel ball run who got an extremely long lifespan from fusing with a rock human which is why he has double body parts (two navels) and this made the higashikata family have rock dna which is the cause of rock disease, the "how do these things have sex huh" line is highlighting the fact we've only seen male rock humans, they can only be male, which is why only the males in the family get rock disease and is why tsurugi crossdresses, so the disease wont show up until he hits puberty or whatever. The kira family also had the disease because theyre also related to norisuke but were able to cure it with rokakaka, and kira developed sheer heart attack to go through bloodstreams in order to use rokakaka safely the same way Doctor Wu did with his stand, and this is why the kira family are doctors just like the other rock humans.

The rock human Norisuke fused with was the "wife" on the family tree who was actually not his wife obviously, but interestingly the character is named "Teru" which explained why Satoru (head doc) is named what he is, but its also the same name as Tooru. Also the "bumping into things if you pursue" stand that Josuke assumes is the head doctor's has eyes that are exact same sun symbol that Tooru has on his shirt so I think it's actually his, and Tooru's shirt and belt also have an S on them which is the letter needed to turn his name into Satoru, make of that what you will.

Ojiro became Makorin's boyfriend because she owns the baseball stadium where Aisho would deal rokakaka, which Kira saw and learned through him since they used to be "friends". Anyway Kira being a rock human (or at least part rock) is the reason Josefumi body parts began to turn into stone when he did equivalent exchange with Kira, and that means Josuke is half (or 1/4th) rock human after they've fused. Also, Rai noticed Soft & Wet's bubbles arent spheres but rapidly rotating strings, in other words Josuke is a spin user which means Josefumi was one, because he's Joseph's bastard son the same way the original josuke was in the first universe. 