User blog comment:TheCarrotSaysYumYum/Dragons, People and Demons.../@comment-171.98.99.216-20120722100129/@comment-4829046-20120722103926

Your english is very good. Easily understandable.

Don't you find it strange that Natsu and Gajeel couldn't pass Freed's runes? Maybe it is because they are damn old. This is not the correct answer but it is the answer to the not old part. But your theory is good too, it explains why the three DS never had any human contact.