MP means nothing, strength matters. Strength beats hax and MP every time. Its why Mest, Bixlow, Evergreen, Midnight and Mirajane aren't god tier, despite their great hax that were originally only overcome by a very situational ability, like Erza's fake eye. Brandish and Dimaria seem OP cause of their hax, but if they ever do come back into the story I guarantee their hax is getting beaten. As of right now I am comfortable saying Natsu, Laxus, Jellal, Gildarts, and maybe even Gray would all be able to beat the likes of Brandish and Dimaria, regardless of hax, because they are simply more powerful.