I actually am super curious as to what the fuck Hawkins is actually doing lol. Everyone else seems to be pretty much around. I think it would be pretty sick if the other WG captains joined the fight up there, as unlikely as it is
Luffy's G4 used his usual level of armament haki. His Red Roc and Red Hawk in this spoilers used the next armament haki level, Barrier Armament. More powerful than the scabbards imo since Luffy has discovered the way of fusing armament levels with his rubber physical strength. I believe he hasn't even pull out Penetration Armament yet, or else it will have different art.