[imported_PiNG]

ONLY in case of using the Grapple (Hand, Fists, what ever you want to call it) Like when you are a Dark Knight and if you use sub job other then Monk, when you fight with a grapple weapon, you don't punch 2 times (bascially use 1 fist instead of 2) so you have to sub monk in order to correct that. The thing is Dark Knight, don't have grapple skills, so unless you sub monk grapple skill will not show


Edit:
LOL, wait, re-read it, you said weapons? If you sub job is theif, then you can't use a theif only weapon. You have to use weapon specified for your main job.