Huh? You think the WG is somehow going to be overthrown before Luffy even gets to Raftel and finds out the secret history of the world?
It’s the battle for the Pirate King that will already be over long before Imu & the WG are taken out.
Also, Imu still hasn’t been revealed yet. They’re still a silhouette even now long after their intro. Besides that, Xebec has long since been defeated while Imu has remained in charge for 800 years. The comparison just makes it all the more blatant.
Xebec couldn’t even make it past the man that wasn’t even Pirate King yet…that same Pirate King afterwards couldn’t do anything about Imu.
Besides that, we already got all of Blackbeard’s commanders too while struggling to deal with the mere likes of Law and getting dismissed by Garp.
Imu’s subordinates on the other hand had a Yonko and his crew fleeing for the hills. And we still don’t even have all of Imu’s servants like the Holy Knights revealed yet.
Also, Luffy is both Roger & Xebec’s successor. Luffy is the one that can gather the other pirates under his banner and actually succeed. Most of the offspring of the previous Rocks pirates are even already accounted for:
Katakuri, Yamato, Marco/Weevil, Hancock, Stussy. Law & Kid are there as well.
Blackbeard is a goner with just Luffy’s Pirate allies taken into account, and yet there’s still the Revolutionary Army and several nations like Elbaf, Wano, etc on Luffy’s side.
Did you think that humongous force is intended for the mere Blackbeard Pirates with Shiryu being their best man? Straight comedy!!!