Why not? Challenge yourself for a second. Although time and history in the world of FF8 can't be change for the most part, it is undeniable that players have influence within the game itself. If it weren't the case, the game would be playing itself, we wouldn't be able to come up with all these different theories, and their wouldn't be any room to speculate about anything. And these are facts. So why shouldn't we consider the influence players have in the lives of the characters in FF8?