User blog comment:Stone Roger/Natsu and Zeref have somekind of relation?/@comment-110.143.150.135-20140705075831/@comment-110.174.150.74-20140722141545

As stated in the final moments of the Tenrou Arc, a Fairy Sphere needs a large amount of energy, which was given by the members of Fairy Tail there. So what could be used to form that Fairy Sphere to trap Natsu, if we go by your theory?