User blog comment:FairyRaven/Fairy Tail Chapter 366: 1000 Souls, Review and Commentary/@comment-5598380-20140109212812

The 1000 souls refer to the price Natsu had to pay fro hitting Franmalth right? And it increased to 2000 souls the next hit.

And i think Silver is Gray's older brother. He looks like about 30-35 years old and Gray is supposed to be 25 years old if not frozen in time at Tenrou Island.