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.