Not sure. Villain flashbacks don’t happen all that often, especially not flashbacks for guys like WW, who’s only a secondary villain. Senor Pink was the exception, not the rule. It might be more likely that when we finally get a full Shanks flashback, we get to see this incident then and it’ll be a nice callback to see Who’s Who there.
I’d like to see all the Beast Pirates have a flashback, they’re an interesting bunch, but it doesn’t seem likely.