I think that i'll use that weapon in my wind grid after all.
My wind grid isn't full yet so i can just replace one of the other element weapon for it.
Also arc and mordred can use that weapon so i have more options for using souls.
However i'm not sure that i'll upgrade the skill yet as i want to save a gems to limit break awakened gaia (when she come out) and level up the skill of the SSR and assault weapon in jack o latern event.