Blackbeard pirates>canonically revo commanders.
Blackbeard came for the strongest Impel down prisoners.
Ivankov was only sent to level 5.
These new admirals are frauds lol
Level 6 isn’t a power level thing. It’s where the WG puts people who’s existence is inconvenient to them like:
1. Warlords that abused the system - Crocodile
2. Warlords that the WG can’t control - Jinbe
3. The son of the pirate king - Ace
4. A WG employee who used his job to murder people for fun - Shiryu
These people make the WG look bad as such, they’re thrown in level 6. It was never about the power levels of anyone.