Doesn't make sense for Law to be a great pirate, which he surely will be by EoS, and not have CoC. Especially when people much weaker than him have it.
Maybe Law will awaken CoC by fighting Kid. Oda needs to let those two do something in the blackbeard pirates arc. I can see Oda bringing back Kid with ACoC and then having Law defeat him and awaken CoC in the process.