King doesn't have CoC
He's no King
Katakuri is BM child. He serves his role as their pillar. He doesn't mind leading when BM is away.
It's not that he refused to lead, he just can't leave his family without cover when BM is away or having a tantrum time. It's not about BM but more about his siblings.
Doffy isn't having 2B+ btw
He's not getting retconned
We saw Doffy post Ts. He didn't get beaten pre ts like Croco, Moriah, Lucci, Enel, Dorry and Brogy who all suffered from early one piece planings
Doffy gets at best 1.7B
The way I see it there are many with the potential of CoC but different aspects hold them back. For example Ace that had well documented father issues and outside press thus never truly realizing his CoC potential.
- King hasn't shown CoC but Kaido saw something in him and aptly named him King. Big Mom invited him to her crew, him alone. Heritage yes, but she likely also knew of his potential.
But King doesn't believe in himself and keeps his face hidden. Zoro has since broken his mask, his crew has seen his face, admiral Ryukogyu has seen him and Kaido is gone. His mentor, guiding star and rescuer. King is now free to do whatever he wants, including becoming a CoC King - the one thing Kaido didn't want in his crew. He saw Zoro do it in their very fight, he might go for it himself now.
- Katakuri has CoC and was viewed as a king by his whole family and every ally/outsider as well, even supernova Capone and shichibukai Jinbei. But he simply didn't lead the crew, or rather,
he wasn't allowed to lead the crew. As soon as Katakuri made a decision, the correct one none the less, he was chastised by Big Mom and Katakuri backed down. He was also very self conscious about his invincibility, a reputation he wanted to preserve in order to protect his family as well mouth/teeth. Both are gone now as well as Big Mom leaving Katakuri free to lead his family in whatever manner he wants.
Doffy > Crocodile, Boa, Jinbei, Moriah, Kuma
With Crocodile at 1.965 I can't see anything less than 2B for him, perhaps even a bit more with all his knowledge.