User blog comment:FairyRaven/Fairy Tail Chapter 424: Avatar, Review and Commentary/@comment-9595671-20150316120218

Say I just realized two things due to this chapter.

I wondered how Bluenote got into Orochi's Fin, but after hearing someone mention who the masked guy could be I remembered that because of the 2nd Magic Council being killed by Tartarus its very possible that the resulting destruction managed to let many prisoners escape and Mashima wants to surprise us by not showing who got out minus the former OS members.

Also with Gray's appearance near the end of the chapter and how Natsu suddenly told everyone they're going to Sabertooth? Well recall how Natsu was shocked by who Future Rogue said killed Frosch? Something tells me that time is nearing and the killer might have been Gray.

Something tells me this arc's starting to pick up now.