User blog comment:Stone Roger/Natsu and Zeref have somekind of relation?/@comment-175.101.10.90-20130809061102

its said that zeref helped acnologia to become a real dragon. my theory is that Acnologia became so powerful after turning into a dragon that he was able to conrol zeref's power as well. Seeing this zeref decided to send natsu(his little brother) and the other dragon slayer into the future in order to protect them and in the hopes that one day they will train themselves, become powerful and kill acnologia which will free zeref. and once zeref is free he would perish as he has lived long enough. i got this thought after watching episode 101. And mavis found him in the nearby forest after their fight with the dragons in the eclipse arc. so maybe he was observing their fight and estimating their strength. after seeing that they couldn't even kill a single dragon, zeref decided to annihilate everyone. And also cobra said that he heard all kinds of voices during the fight, so he must have heard zeref too.