User blog comment:FairyRaven/Fairy Tail Chapter 465: 400 Years, Review and Commentary/@comment-71.222.52.171-20151209013120

The time travel/ovous memory manipulation now makes perfect since to what Grandine said to Igneel as she said to him that she hoped that Wendy and Natsu would have a better relationship this time when she spoke to him directly implying that they had met before (400 years ago) but they didn't have a good relationship so when they traveled through time they erased Wemdy and Natsu's memories of said meeting but didn't work 100% on Natsu as he vaguely remembered Wendy from somewhere before when they remeet for the first time in the guild alliance.