People freaking out that only ACoC users can damage HKs, we will see chars just restraining them like the bubble gun used against Seras.
Don't think non CoC users will suddenly get ACoC because they need to fight HKs.
Law hasn't shown CoC so far, I don't think he gonna get it but his DF may in itself be able to counter them. Ivankov and Kuma ain't getting it though Kuma with his DF may have some counter.