A thought: Could it be, that Smoker and Tashigi were intended to play the role, that Coby and Helmeppo have taken on? In my mind, Smoker feels inspired by Les Miserables Javert. Specifically the musical version, who is obsessed with catching Valjean, who is someone who got away from him, despite being a very capable police officer (or whatever rank he has). And while that is true for Smoker, he hasn't appeared in forever (I think it's true, not sure, it's been sooo looong).
We don't see Coby and Helmeppo too often, but I think they met the crew at least a few times? Am I misremembering?
Like, I think the idea was, originally, that Smoker would be Luffys Garp, which is now probably Cobys role. The second person is also both times a swordfighter.
I mean, however it was planned has changed anyway, over time, I would think. I don't think, Smoker would have done what Coby did throughout the series. And yeah, it's a moot point anyway, but I still am curious. Because Smoker feels like someone set up as a recurring villain, and then gets dropped. Or maybe he was just planned for Alabasta, he and Tashigi got a bit of an arc there, and that was that.