User blog comment:FairyRaven/Fairy Tail Chapter 470: Hybrid Theory, Review and Commentary/@comment-25723629-20160126132223/@comment-4829046-20160126134635

Get ready for some bullshit about how they 'adapted' after facing dragon-form Acnologia a couple times while the Saints and Spriggans only saw him once and thus could not fathom the power. All he did was run and slash Serena, hardly a measure of his magic or abilities.

Which is why I am hoping that the 'sickness' Natsu is experiencing has some relation to Dragonification due to exhausting the protection from Igneel. Maybe Gajeel can use Dragon Force and gain the hardest metal-skin in existence to somehow defend or immobilize(like with Laxus and Faust), which will still be more logical than being able to keep up normally. Wendy's DF can probably boost speed to excel that of Acno but not too sure about damage increase. They NEED teamwork if they want to survive and unless Mashima plans on killing off the 3rd gen slayers, Jellal and OS, Acno won't be saying "X more to go" after this.