About Luffy's crew members having CoC, beside Roger's crew having CoC users, there's this bit
with us being told that Kaido thinks that there should not be that many Conquerors.
likely because of his experience among the Rocks.
Luffy could prove him that he does not need to stiffle the ambition of his crew members, and still lead other Conquerors, forming the greatest crew in the world. Which is what the Rocks used to be in their time
Kaido and Big Mom, both CoC users followed Rocks D. Xebec.
Now we have Monkey D. Luffy, with Sanji being given significant focus in Big Mom's arc and Zoro being given significant focus in Kaido's arc.
with us being told that Kaido thinks that there should not be that many Conquerors.
likely because of his experience among the Rocks.
Luffy could prove him that he does not need to stiffle the ambition of his crew members, and still lead other Conquerors, forming the greatest crew in the world. Which is what the Rocks used to be in their time
Kaido and Big Mom, both CoC users followed Rocks D. Xebec.
Now we have Monkey D. Luffy, with Sanji being given significant focus in Big Mom's arc and Zoro being given significant focus in Kaido's arc.