User blog comment:IamJakuhoRaikoben/Chapter 443: And Then, The Land Was No More, Review./@comment-79.141.163.21-20150707040944/@comment-203.111.234.105-20150707171855

^ i agree with him. Telling about Mirajane, I don't think she doesn't need that training during their one year skip anymore, since she's already powerful, that the demon's latent power was within her. Even if it's anime-only, atleast Mashima approved that she's powerful that Makarov forbid her to use her Halphas. And based from Tartaros arc, Erza's reaction towards her demonification caused her trembling that she was horrored to what Mira would bring and Sayla noted her as dangerous one. So don't underestimate Mira's character even if she's a supporting character.