As far as I'm concerned Laxus earned his win, Gajeel earned his win (did Elfman and Cana actuaully do anything? well anyway), Erza and the whole bunch of them spend a whoping 1 minute training, if you can call groaning on your hands and knees "training." Erza in particular didn't even go though that.
If that's all you need to justify power ups of this magnitude then I guess we can just call "training" every time a character is down in the mud. "Oh he's not actually crippled and under 5 tons of rubble, it's training!"
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