User blog comment:FairyRaven/Fairy Tail Chapter 435 & 436: The Cry of Victory & Memoirs, Review and Commentary/@comment-26287497-20150518155942/@comment-83.253.247.186-20150518215322

I Think the stuff witch Frosch and Rogues evil shawdow will show up again in the future and one of the reasons for the Avatar arc was to foreshadow when it will happen for real.

Gray being chummy with Frosch is suposed to make us wonder why he would ever try to kill such a cute little guy.