User blog comment:BlackWizardZeref/Fairy Tail Chapter 394: Juvia vs Keith Review/@comment-25244540-20140725085202/@comment-25244540-20140725090049

Well there's still the fact we don't even know if END needs a vessel in the first place. I don't recall seeing anything in the past few chapters that says END needs a vessel, if END's the strongest demon it seems unlikely to me he'd need one.

The way I just see it it doesn't look like END can be in Natsu because it doesn't seem like he even needs a vessel.