Shouldn’t it happen before the war starts, like the rest of the warm up clashes? Momo is about to be executed, Yamato and Luffy have made their appearance, and the Scabbards will be reaching Kaido soon. I don’t see how we can wait any more than 3 chapters for the war to actually start, unless Oda pulls a flashback out of nowhere or has garbage pacing. Zoro doesn’t have enough time to have anything more than a clash with a F6. It would make no sense for one of them to be quickly and anticlimacticly taken out before the war even starts