User blog comment:Miskos3/Fairy Tail 526: My Name Is..., Review/@comment-30338537-20170313155029/@comment-7418318-20170313171548

I guess that depends on whether he can only cast those spells he copied for a short time or they stay with him permanentely.

If the former is the case, he certainly would be at a massive disadvantage against the Edolas folks, though his physical fitness wouldn't leafe him entirely helpless I think.