User blog comment:B214/Chapter 482 review/@comment-5303512-20160418121014/@comment-7418318-20160418122255

Eh... I'm not sure on that issue. Celestial Spirits are strongly tied to the summoner's power-level.

With Historia we don't know if that's the case. We only know they are bound to Neinhart's will, but the only comment on their abilitie we've had so far seems to indicate that they are an exact copy of what the living person was like.

So can we equate Historia copies more to Celestial Spirits or more to semi-autonomous creations like Silver or Etherious?

Surely no one would suggest to contribute Silver's battles to Keith, or the Etherious' battles to Zeref.

I'm going to withhold judgement on the matter for now until we know a bit more about Histoira.