Henry,
That is exactly what I suspected.
(Several years ago you were investigating the possibility of writing a set of books that detailed the world of Arcanis from a god's-eye point of view. And while I figured that might kind of spoil the fun, it would also provide the answers that everyone wanted. Thankfully, that wasn't necessary. It's a lot more fun to find out piece by piece and work the puzzle.)But what I was suggesting is that someone (the players) build an online timeline that condenses what we know (as well as what we think we know or what we just suppose) in one place. So while this supplement says these events happened at this time, and that supplement says that those events happened at this other time, if they were gathered together in one place, it might make looking for clues (or just grasping the entirety of the known history) that much more possible.
As a personal example, I'm a very visual person. When I can "see" something working in my head, I can analyze it and commit to memory fairly easily. But when I don't have a clear mental image, it's much harder for me to memorize. So, when I was in grade school or high school and my history teach would tell me to memorize who did what and when, I had a lot of trouble. I barely made passing grades and promptly forgot everything after the test. But when I had a teacher who told me the stories behind the names and dates, or when I watch certain shows on the history channel, it all comes alive. I see the big picture and how person-X might have started a war because he had a cold. (fictional example.) But it all fits. Consequently I'm able to remember those details and reference them. So I think it would be with a timeline. If the players got together and amassed key points in Arcanis history (from existing references) we might be able to see patterns and pieces that were difficult to see before. My biggest concern would be that people might try to put too much information in there and begin to cross lines with respect to copyrighted information. I certainly wouldn't want this to discourage the purchase of any PCI products. (Actually, I would think that it might just do the opposite if done correctly.)
Anyway, those were my thoughts.
Scott