I don’t think Apoo will switch sides tbh.
He’s been a persistent enemy. I don’t think the alliance would take him cause of that.
Their was a theory about real people in the past in our real world, based on the theory both Queen and Apoo where teammates(both where looking like Queen and Apoo), in this theory however the guy who look like Apoo betrayal the guy who was based on Queen.
And that theory was made years before wano even happen and what we get?
Apoo beeing a beast pirates, beeing goog with Queen and get almost killed by him, in case everything happen what the dude predict with his theory years before wano happen.
In case the theory hint that Apoo betray Queen and based on our current story Apoo probably doing it as the theory predict it years ago.
Drake+Apoo+Chopper vs Queen going to happen, I assume both Drake and Apoo end up as hypetools too if Sanji is Queen final matchup.
Perospero taking down Neko and Scillian
Jack beating Inuarashi, Law come into the game
King defeat nerfed Marco,Izo and Kawamatsu, Zoro helping
Queen defeat Drake and Apoo, Sanji helping.
I can see something like this.