- 12,675
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To be fair, they explained exactly in the movie why we haven't heard of him before.. he's an upstart who became the top enforcer of the High Table specifically because after the events of John Wick 3 the High Table felt threatened and he offered to terminate the threat for good.. so they gave him carte blanche to get rid of John Wick. The various parts in the movie where he is punishing past or current allies of John Wick is him doing the enforcer job of making sure no one is going to think of helping a rogue assassin like John Wick in the future. As for the duel, it was an old and mostly forgotten rule that the upstart marquis wasn't aware of, but the High Table adjudicator had to accept it once it was made official by Winston.
The John Wick underworld seems so vast and convoluted that I don't think seeing new threats is really surprising, especially since John Wick usually eliminates most of them in each movie so there's bound to be some replacements going on.
I think the only thing left for a John Wick 5 was him going after the High Table itself and wiping out all 12 of them (11 now? Was that guy in the desert a member?)
I expected that to be the situation for JW5 after he dealt with Donnie Yen and the Marquis in JW4. But now he doesn't need to go after them, plus we got the perfect end point, so I don't see a reason to continue.