User blog comment:Sargenttacos115/Natsu and Gajeel age Theory/@comment-76.23.189.173-20140815034915/@comment-99.238.190.104-20140818041105

Maybe instead of becoming natsu, he like put his soul into Natsu, so when igneel communicated with grandeeney through natsu. So natsu and gageel weren't able to pass through because the dragons soul is in them. The dragons are most likely over 80, so that explains why in edolas there was Wendy and porlyusca, yet natsu and gageel could go through he runes.