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They'd be able to fire it, not accomplish the same feats by themselves. Read above, Zeref with Fairy Heart and Space Between Time was still stated to be unable to defeat High 6-C Acnologia when he was weaker. Fairy Heart doesn't make you as strong as Etherion, but gives the user the ability and the option to use such a weapon if possible. It wouldn't scale to their striking strength or AP since they'd still need Etherion in order to cause that amount of destruction. Which is impossible now due to Etherion being useless in the Manga since it doesn't work anymore. The point is that users of Fairy Heart don't become High 6-B when using it. All it does is give the user a boost in strength which isn't countable, and had the ability to deploy Etherion. The Space Between Time isn't even worth the effort going over again since it's never stated in the same sentence as Etherion nor has it ever been confirmed or even implied to be stronger than Etherion. All it does is give time magic and makes you stronger. Attempting to scale Etherion to these is incorrect, for various reasons. Think of Etherion as a nuke (Funnily enough it's called a magical nuke in the Manga.) someone could drop it but it doesn't scale to the person who dropped it. There's nothing to suggest Zeref and Co would be able to tank Etherion, the best one you could argue about is Acnologia. But that's even countered by the fact that Acnologia couldn't control The Space Between Times and had his body and soul spilt apart as a result. He certainly got stronger but the fact that he couldn't control something that's not as strong as Etherion means something.