in chapter 1037, Kaido says he hasn't fought anyone seriously in a long time. 2 years ago during the Marineford arc it is said that (correct me if I'm wrong) 2 days ago Shanks was fighting Kaido. So the off-screen match between Kaido vs Shanks wasn't a serious match? did they really fight or was it just a marine interpretation? Yeah, when Kaido remembers the only characters that can fight him, Shanks appears alongside Roger, WB, Xebec and Oden, but did they really fight seriously during Marineford or not?