User blog comment:IamJakuhoRaikoben/Chapter 323: The Shadow That Comes And Goes, Review./@comment-288216-20130316043051/@comment-4449950-20130316043958

From what I have gathered, Jellal knows nothing on the Eclipse 2 Plan or the Eclipse Plan. The only thing he does seem to know about is the Eclipse Gate, and only because Lucy used it to travel back in time and told him that she used it.

Knowing about the existence of the Eclipse Gate, Jellal then reasoned that every year the Magic presence they have felt is from it sucking the Magic Power of those at the Games, but noted how this year the Magic seemed to move because a residue of it was stuck on Lucy after she used the Gate.

He then pointed out that Lucy said to have arrived on the 4th of July, but remembered trying to chase somebody after Wendy's battle on the 3rd of July (when Doranbolt stopped him). Before, he had just assumed Lucy to be lying and thought she was suspicious, but, looking at it from a different point of view realised that he may have been chasing a completely different person on the 3rd day, which led him to reason that there is a second person from the future, something which worries him because he doesn't know their motives.

At least, this is what I got out of the pages.