Imagine! That would've been a curve ball to the ending of WCI.
Luffy defeats Kata.
Sanji bakes BM a cake, but she still isn't pacified.
Brook offers to become her new husband and handler. BM is intrigued by the idea of having skeleton kids.
The SHs leave WCI with a Yonko on the leash.
Three islands over, Kaido wonders wtf is wrong with the strawhat kid and starts doubting himself.
Brook being Katakuri and Perospero's father in law would be so funny to me.
I think once Sanji/Chopper help fix Big Mom's health problems, Linlin will make her move on Brook. I think each straw hat is going to have like their own territory EOS. Usopp Elbaph, Nami Sky Islands, Zoro Wano, Franky Water 7, etc.
Soul King rules the land of Soul Pocus. If Linlin's Fruit is awakened, too, she can probably form her own Soul entity, like Brook's does.
Astral Sex intensifies, Linlin and Brook's spirits are going to get frisky with each other, someday.
I also still wonder if lilith can clone a new body for Brook without a skeleton, then put him in it. Lots of possibilites.