Hancock doesn't want to be PK.
Yamato doesn't want to be PK,
Doflamingo wanted to rule over EVERYBODY, but no necessarily become PK.
Zoro doesn't want to be PK, his goal is to reach a meaningless title and follow luffy around for the rest of his life.
Ace didn't want to be PK, but also had CoC.
Rayleigh was the same of zoro in the sense of being a submissive underling follower to his captain, but he stillwhad CoC anyway.
Don chinjao wanted to be the richest Guy ever, not sure If PK was necessary for that.
CoC only requirement is If oda wants you to have it or not.