But I wouldn't be surprised to see Kaidou, Big Mom, and Blackbeard also having CoC.
And at the end of the day, Luffy vs. Blackbeard will (very likely) end up in Creativity/Determination/Quality vs. Brute Strength/Cockiness/Quantity. Your typical shonen fair. Although with Elephant Gatling Gun, it's hard to say that Luffy doesn't pack raw power as well.
Aside from that, how many techniques has Sasuke 'copied' with the Sharingan I honestly ask you. I haven't seen him spamming other things that he himself came up aside from the standard MS-techniques, some of which he devised as well, such as Enton. Kirin, and most of his Lightning based techniques were all his own ideas, aside from Chidori, which was taught to him by Kakashi.