Yeah, that's basically what I think. The main issue here is that we just don't know a whole lot about what spirit energy really is. For example, let's say you were to fly to another planet capable of sustaining life. Would the spirit energy there be any different from the spirit energy found on Gaia/Planet? Is it the same wherever you go? If it's the former, then I think spirit energy would be drawn to the planet where it originated from. If it's the latter, then spirit energy probably just looks for the nearest planet and assimilates with the Lifestream there.

well, i think that maybe the energy was part of the planet, so it would be able to find the planet again. it would always stay a part of the planet, regardless of where it was in the universe.

yeah but that doesn't mean you can find yourself, if I lost a finger somewhere (:() it wouldn't know where I was

In all fairness to the Lifestream, you and your finger aren't made entirely of spiritual energy. Magnets can attract and repel one another, who's to say the Planet's Lifestream isn't the same? Now that I think about it, the Lifestream would have to be a pretty powerful "magnet" considering its size alone. If something dies in outer space, it probably wouldn't be that much of a stretch to assume that the creature's spirit energy would find its way back to the Planet. I mean, in the world of FFVII, a tiny black rock can pull a huge meteor into the planet. Who's to say the planet itself can't do the same with pieces of the Lifestream stranded in space?