the individuals arriving are ones that no one will expect in a million years
Okay we can throw the obvious answers away then
Let’s think: it’s not Revos, Cross Guild, Smoker/Sword, Grand Fleet and BB Pirates
Shanks would be awesome but that’s too soon

maybe a former ally from East Blue like Gin but I don’t think that they can destroy an entire ship
Maybe the destroyed ship is a hint
Only heavy hitters can easily destroy a ship or giants (like Kidd's ship)
Saul was mentioned in this arc so maybe he sent some giants to Egghead and they’ll sail together to Elbaf
Saul maybe said: "Luffy and Robin found 3 RP's, so it’s time to tell them where the fourth one is. Go and get them."
but why should they warn Kizaru about them? He can pretty easily beat those giants
I don’t know to be honest

or Shanks twin or Garling showed up but they wouldn’t destroy a Marine ship

edit: I hope it’s not Kaido
Katakuri is also a possible candidate
 
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