User blog comment:IamJakuhoRaikoben/Chapter 327: My Part Too, Review./@comment-5113042-20130413152152/@comment-5951335-20130414044343

I like your theory, but I think it might've been Layla Heartfilia who brought Natsu and the others to the future. She died in X777, the same year when the dragon slayers said their dragons disappeared. Her page on the wiki says that her health was fading, so I think that because she knew she was dying, she used her magic to open the Eclipse gate and bring Natsu and the others, which caused her death.