Listen closely, there is meaning in my words.
- Smooth Criminal
I'm not reading the script and other text leaks, so the impression I got is that the Guardians are just a manifestation of the Lifestream that Sephiroth hijacked to help him with his plans, all the while passing it off as some kind of 'Destiny' to mess with Cloud (& Co.) because he is incredibly extra. Does that seem pretty close so far?
A very on point summation. Sephiroth being "extra" lol that's too good xD