Facts
Jack had the best intro and hype
Jack did so much, he fought dukes 1v1 12hrs each for 5 days straight
Fought sulong dukes
Fought sulong inu
Jack endurance and stamina>>king/Queen
WsW and Ulti have better haki mastery than King and queen!
Kaido >= Linlin
Doffy < Katakuri
King ~ Smoothie
Queen ~ Cracker
Jack >~ Pero
You don't understand how things work. The stronger the attack the faster it will burn through an opponent's endurance. That's the reason Kaido put down Luffy in an instant even though he could fight against Katakuri, at times in base mode, for hours.
Kaido > Linlin - Big Mom is a joke that has been embarrassed by just about every main character.
King > Katakuri - King requires ACoC Zoro to defeat him while Katakuri was tagged by base Luffy. ACoA Zoro scarred Kaido.
Queen > Smoothie - smoothie was completely useless during and couldn't stop King or Marco with a ship full of crew mates.
Jack ~ Cracker ~ Doffy - they're all in the same level. Even though Jack and Cracker talk shit about Doffy he was still give them incredibly difficult fight.
Pero ~ he wasn't embarrassment doing WCI. He thought he was going to do something during Wano and was put in his place.