if Kata have it ... why not ... who cares
that's a fucking good argument 
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Oda made it clear no CoC users will be fully subservient to Kaido for long periods of time (or even Whitebeard). That's why he can't get any Conqueror's on his crew.
Even Whitebeard knew he couldn't keep Oden under him for long due to what happened with Rox.
The special thing about guys like Luffy and Roger, is that they seek "freedom", where CoC users have a level of autonomy they're not going to get otherwise. For Kaido this was "Joker" who was only loosely associated with the crew and had his own kingdom/crew.
As for Katakuri, he has familial duties and he'll be the head of the Big Mom Pirates after BM bites the dust. That's been made clear. King doesn't hold that prestige.
Even Whitebeard knew he couldn't keep Oden under him for long due to what happened with Rox.
The special thing about guys like Luffy and Roger, is that they seek "freedom", where CoC users have a level of autonomy they're not going to get otherwise. For Kaido this was "Joker" who was only loosely associated with the crew and had his own kingdom/crew.
As for Katakuri, he has familial duties and he'll be the head of the Big Mom Pirates after BM bites the dust. That's been made clear. King doesn't hold that prestige.