Fair enough, and I hope that explanation is an awesome one! There is a ton of evidence that most Planets are living organisms in the FFVII universe, hell, who's to say JENOVA wasn't herself a planet that just ate other planets to live and exist?Yeah i agree, but when it cut to Marlene and our characters we don't see the lights.
In Dirge of Cerberus we see that the lifestream is much bigger than what it represents what we see on this planet. We see what happens when a planet has reached the end of its life, the lifestream basically cuts it losses, abandon the planets and shoots into the sky, and we see similar lifestreams traveling in the same direction. So yeah we do need more of an explanation.
I eagerly look forward to more interesting lore to be espoused, there is a ton of wiggle room for expanded circumstances!