I don't think oil is going to get touched. Mostly on the basis that a i230 weapon by itself is large useless and easily replaced by Padjali weapon. Now, the cost might be chopped but I'd still advise people to dump into Umbrite and let the weekly slowly tick up. It takes 7 weeks to get an i260 without getting that a10s clear so 5 weeks of oil getting, combined with reduced umbrite cost, and then 2 weeks to quickly grind up the singing clusters seems reasonable to me.
At that point you either get into the (I assume) super grindy next step or get in some A11S clears for gobdip.
Everything seems pretty balanced with regard to weapon progression on the anima step right now. Other methods are faster, but Anima's a bit more reliable without so high a skill ceiling.