Oh, I misunderstood then, I think. I know you have to get it the first go, but I was under the impression you can just get replicas for other jobs if you have got a least one Zeta?
Nope. If you want any replica of any job's 2.x relic stages, you must have gotten its zeta and either 1) bring it with you to the dude in North Shroud, or 2) trade it in for the 3.x anima step, which will cause the game to "remember" that you had it and unlocks replica purchase for that weapon without having to carry it with you anymore (since you will no longer have it)