but there is just no point
doing a sequel like that would be like doing an entire game on how Selphie was doing at Trabia Garden before she transfered.

Do movies make a prequel of a character?
Take Lord of the Rings for example
We dont know much about Sauron other than he is this evil guy who got power hungry
THERE! thats it. We dont need to know anymore. Because that is just enough info

we know everything that happened with Laguna before we met him
because the game breifly explains it in the dreams of him
so doing a prequel would just be combining all the dreams in FF8
which is pointless