Know who had a personal grudge against Arlong but couldn't do shiiieeeet?
Nami.
too weak
Know who had a personal grudge against King Wapol but couldn't do shimmy shimmy ya?
Chopper
Again week
Know who had a personal grudge against Croc but couldn't do shiola?
Vivi.
again weak
Know who had a personal grudge against Enel but couldn't do shababla?
Wipa and Gan Fall.
too weak
Know who had a personal grudge against Lucci but couldn't do shiitake mushrooms?
Eddie, Franky and his brother.
They didn't have grudge against lucci it was Spandam
Having a personal grudge doesn't give you the garuantee of defeating an arch villain on your own. Luffy is the main char and has dominated all other competition who tries stealing his bait. Mingo is Luffys', nobody is going to take that from him.
And get real guys, Luffy also has a personal grudge against him. He made a friend of his cry. Know what happened to the last person who made his friend cry? He bought his foot down on him and his park and 1 shotted him.
again it means nothing....last chapter made crystal clear that Law will defeat doffy