characters and factions I think got a shot of appearing at Wano.
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Grandfleet
I think its very possible, but in order for that to happen, I think Luffy needs to get his beaten close to death first, just so the captains will react to the his vivrecard burning and then making a move towards Wano.
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Marco
I think its also very possible, but it would probably require for Weevil to arrive at Wano too, then he could leave and heal Luffy that was just beaten.
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remainder of WBs commanders
maybe Neko is late because he is looking for some of them?
Maybe Izo is in Wano or on his way to wano?
either way, it could be their time for reappearance, since the plotline about them splitting up needs to get resolved, and Wano feels like a good place to do so.
-Moria
past beef with kaido, and appeared recently, would think he got highest chance of appearing.
-Weevil
his subplot been slowly going forward and teased since we found out wgs got new shichibukais and all the way back before film Z where it was stated a new shichibukai cut off Zs arm in the past, it could be time for him to make an appearance.
-Lucci and CP0
Cp0 has already been present at wano, but with Lucci back in the story and Oda reminding us of him at both dressrosa and reverie I think he might appear as well as the face for wgs interests in wano
-Marines,
Either Kizaru or Greenbull, or both, who knows.
-The rest of the Big mom pirates,
If Big mom is getting wrapped up in this arc, I think we need pudding there to use her memory powers somehow, and maybe we could find out more about her eyepower, Katakuri could also appear but more in the role of a anti villain/anti hero, and then maybe we would finally get to know what happened with Jimbei and the fishmen, the germa 66 and Pekoms, if we dont find out about them sooner.
This would wrap up the story of all the great big pirates, Big Mom, Kaido, Whitebeard and his commanders and his self proclaimed son, their connection with Rocks, and Odens flashback.
Maybe theres even a connection with Weevil and Moria if they both appear in the same arc? Thinking about Weevils zombie/frankenstein-like appearance.