[A devil fruit user. Which probably means he was an enemy of the Strawhats. Was he allowed to really pick sides in his work?]

And your own jitte wasn't in the smithy when you showed up?

[Either way, he had to figure out a way to compensate for a weapon that apparently weakened the person that used it. It was definitely going to be a challenge, but if he was able to figure out Nash's special weapon, he could do this.]

Well, I guess I can give it a shot. If the prototype isn't to your liking, I can always make another.