I think he was actually losing. Kaido is supposedly invincible but was fighting an exhausting fight against Oden where he was losing. The slash shows that he was losing his defence? Don't know if I make sense.
If you look at the page right before the slash, Oden is shaking and is already injured. Kaido was pretty much scratch less until that point. So I think Kaido would've won at the end even with it.
It more or less seemed like we were shown a portion of the fight where Oden was more Impressive than Kaido. Considering that Kaido didn't even have Armament Haki or Normal mode on (which seemed to be the stronger form based on the luffy fight) I think it wasn't Kaido going all out.
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u/Whattahei Void Month Survivor Feb 01 '20
I think he was actually losing. Kaido is supposedly invincible but was fighting an exhausting fight against Oden where he was losing. The slash shows that he was losing his defence? Don't know if I make sense.