User blog comment:Darknesslover5000/Fairy Tail 258 - Sabertooth/@comment-2245892-20111106203804

I dont think its actually light and Shadow, I belive as I have mentioned before that the 7 year period was the time of the dragons and during the FT's magic act, the new DS were trained. If you read carefully, they are the new Steel and Fire DS. A supporting fact of this claim would be that the one who said he trained under Gajeel ate the supposedly steel arrow that was launched at him. Another two supporting facts would be that the other claimed he could create stronger fire than Natsu as well as the next chapter referring to the Sky Dragon. So I don't believe "new" dragons have taught these two DS but instead they are the next generation of DS that comes every 7 years. Hmm...also raises a question...How did Acnologia find FT? Maybe that dragon is the signal for the dragon's return as it is there as the "strongest" dragon in order to wipe out the DS that live currently every 7 years to prevent the deaths of the dragons that teach the new batch.