In One piece whenever strong people are executed the executioners in khaki getup are the ones to do it. Even though they are much weaker than the people the execute.
for eg:- At Marineford when Ace was getting executed the executioners even got injured by Crocodile and they still called extra executioners after this. Why didn't Sengoku or anyone else do it ? The new executioners weren't even strong enough to stand against Luffy's haki.
