The fuc**** power levels in the previous chapters are unheard of. Even if you put in together all the big hitters in the current story, you won't get this level of firepower especially in terms of Haki. As of the moment it's just Shanks, Luffy, Mihawk, and possibly Zoro are able to contend in the same stage as these legends but at this point I would include Blackbeard in there cause there's no way the mfer doesn't have Conqueror's too. Even then, the fact that both Garp and Roger infused their voices with haki to call out to Rocks? Next level badassery.
We haven't even talked about the lore implications that Imu is afraid of two figures and the current generation has both Davy's and Joyboy's successors rampaging around while a Celestial Dragon who was Roger's protege is still a dominant player while just moving around subtlety while casually proclaiming "It's time to claim the One Piece"
Imu should be quaking in their boots rn. The G** of Fire/Warrior of Liberation himself has awoken alongside Xebec's son while the Elders have been proven to be not be enough against a newly awakened Nika. We'll see how the G** Knights will fare against Luffy, Zoro, and Sanji soon.