Jahr7: Though it doesn't deal directly with the question you asked (well, it does at one point, but not in the same context) here's it's a pretty good thread about FF8's ending, time travel, and a bunch of other stuff.
Warning 1: This thread is from waaaaaaaaaaaaaaay back.
Warning 2: This thread contains tons of spoilers and lots of icky math/science stuff.
Warning 3: If you post in that thread, a mod may come down from on high and bash your wee little skull in. Please be nice and leave the thread in the old dead thread graveyard.
Warning 4: Lots of Zima != good, coherent posts. :
http://forums.qhimm.com/viewtopic.php?t=11Edit: See? I told you. Zima and posting is not a good mix, kiddies. I forgot to put the link in.