After WCI, Oda stopped drawing CoA Hardening for a lot of characters that clearly have it.
None of the F6 except WsW and Ulti showed black Hardening even though all are confirmed to have it. Jack never showed Hardening. King and Queen only showed it once. Kaido never showed Hardening. BM only showed it twice. Law and Kid never used it despite having CoA. Luffy is the only character that Oda consistently draws Hardening for nowadays. Back in PH and Dressrosa, characters like Vergo, Doffy, Sai, Chinjao, and even fodders like Boo were consistently drawn using CoA. Why does Oda draw CoA Hardening for characters like Boo, but not the Calamities?
None of the F6 except WsW and Ulti showed black Hardening even though all are confirmed to have it. Jack never showed Hardening. King and Queen only showed it once. Kaido never showed Hardening. BM only showed it twice. Law and Kid never used it despite having CoA. Luffy is the only character that Oda consistently draws Hardening for nowadays. Back in PH and Dressrosa, characters like Vergo, Doffy, Sai, Chinjao, and even fodders like Boo were consistently drawn using CoA. Why does Oda draw CoA Hardening for characters like Boo, but not the Calamities?