User blog comment:Sargenttacos115/Natsu and Gajeel age Theory/@comment-108.250.20.180-20131117185004/@comment-108.250.20.180-20131118195347

All of this could even claimed to have been foreshadowed as the reason Makarov took Gajeel in. He was aware of the past via Lumens Histoire in some fashion and wished to help stopping Gajeel falling into shadow and becoming Acnologia. However, cut off from the guild and his friends alone in the past facing dragons in a fight to the death, he could give in and let his despair take over.