User blog comment:IamJakuhoRaikoben/Chapter 327: My Part Too, Review./@comment-5113042-20130413152152/@comment-112.198.77.52-20130413161750

Ohhh..adding to my theory maybe Natsu, Gajeel and Wendy were sent earlier than Sting and Rogue. Natsu and co. to X777 and Rogue and Sting after the Tenrou Island Arc.