If he's doing Abyssea things, as the -30 accuracy Gaxe should be good(assuming he has atma/cruor buffs).
You could argue that it won't be as great without good baseline gear(full AF3+2, etc), but I really can't justify creating a weapon for farming AF3 or anything else of the sort. You can literally finish all of it in a fraction of the time it would take to create a magian alternative.
Imo, aforementioned AH gaxe -> all Abyssea atma/cruor necessities -> AF3+2 > leftover necessary gear(Goading Belt, Zelus Tiara) > Ukon > rest of the game
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