: Soulblighter himself doesn't even know the process, so
: why would he be able to teach others? These are 'the
: Children of Bahl'al,' after all, not of Soublighter or
: The Watcher.
Sadly, this is where your theory starts to fall apart. You're assuming both that Bahl'al never taught anyone else the dream and that it's not possible to raise the dead with anything short of dream magic. You're assuming that they're called 'the Children of Bahl'al' after their sole creator and not after their first creator. Your timescale argument assumes that Bahl'al searched for the dream of unlife because Balor ordered him to, and not because he was simply a power-hungry maniac, without which assumption there's nothing to tie Bahl'al's actions to the time of Balor, and hence nothing to separate him from The Watcher.
And, much as it's nice to see someone bring in a few original ideas for once, that /is/ a lot of assumptions to be making.