Board Thread:General Discussion/@comment-1173941-20130611084051/@comment-6697950-20130613175253

Well, he doesn't have to mention the guild. Asuna could just notice Kirito's new overly depressed and power-levelling state. So, it's still a possibility, albeit a minor one.

Lisbeth's side story sounds to be the most likely one, as then we'd have the 3rd person.

3rd and 4th options seem highly doubtful.