It's so obvious that the Rocks crew parallel of the modern era will be Cross Guild lol.
Newgate - Mihawk: Title of "strongest"
Shiki - Crocodile: Lost limbs replaced by weapons, smoke cigars, bad-mouthed, in search of Ancient Weapons, both possibly being the first real challenges in Roger's/Luffy's path
Kaido - Moria: Self-evident per their rivalry, possible Ancient Giant lineage (horns) and being sore about their defeats to Roger/Luffy (Kaido mentions having personal beef with Roger in 1096, most likely because he squashed him at some point)
Linlin/Gloriosa - Hancock: either strongest woman in the world parallel or Kuja parallel. Both work.
Buckingham Stussy - Weevil: self-evident
The other members (John, Ochoku, Silver Axe, Gill Bastar, the half-elephant zombie guy) aren't as important but they might have counterparts as well. And you also have Doflamingo, Law and other ex-Warlords as other potential Cross Guild recruits in the future so it might play into that.
Newgate - Mihawk: Title of "strongest"
Shiki - Crocodile: Lost limbs replaced by weapons, smoke cigars, bad-mouthed, in search of Ancient Weapons, both possibly being the first real challenges in Roger's/Luffy's path
Kaido - Moria: Self-evident per their rivalry, possible Ancient Giant lineage (horns) and being sore about their defeats to Roger/Luffy (Kaido mentions having personal beef with Roger in 1096, most likely because he squashed him at some point)
Linlin/Gloriosa - Hancock: either strongest woman in the world parallel or Kuja parallel. Both work.
Buckingham Stussy - Weevil: self-evident
The other members (John, Ochoku, Silver Axe, Gill Bastar, the half-elephant zombie guy) aren't as important but they might have counterparts as well. And you also have Doflamingo, Law and other ex-Warlords as other potential Cross Guild recruits in the future so it might play into that.