User blog comment:Inept Wiki User/Question: Untold Tales/@comment-15267891-20130419002715/@comment-7418318-20130419072747

The first one we can answer already.

Zeref wanted to stay away from Humans to avoid accidentally killing anyone, so an uninhabited island that people can't even get to (remember the talk about a barrier being around the island most of the time?) makes a perfect spot for him to hide at.

He certainly seemed very surprised when he heard that the island belonged to a guild and even more so when he saw Natsu.