More about souls

I got several interesting responses to my last post.  This is my attempt to answer at least three of them, taken from my writer's journal.
My problem is probably rooted in the fact that I didn’t think through all the ramifications when I first introduced these themes.  If I had waited to set everything in stone, though, I would never have started writing at all and things might not have taken the interesting turns that they have.  Now I’m playing catch-up, looking for the underlying truths which, hopefully, were always there since I do believe that my subconscious mind automatically forms patterns.
Yes, the Shanir ability to reap souls must be very rare, or at least to reap them and then to pass them on.  The Dream-weaver had it.  Jame has it.  Gerridon has struck out repeated with Jame who indeed was bred for this very role.  And yes, seduction is involved (the willing sacrifice), although this only occurred to me in hindsight.
Ishtier also seems to have done this (separating soul from body) to Bane to create the Lower Town Monster, an issue yet to be resolved.  Can Bane’s soul still be pure after feeding on all of those children?  Does it matter that the Monster is essentially mindless?
For that matter, as pyoro 2 points out, souls seem to be easily detached.  That happens over and over again, especially when demons are involved.
There’s also the whole issue of some Highborn being able to carry other Kencyrs’ souls.  That’s what Gerridon apparently did to Bender, but he must not have been able to feed on it. Or, given Bender’s state when he reaches Jame in Demons, Gerridon only managed to nibble around Bender’s edges.  I think Bender was more of a hostage than a meal.  As such, he could be used against Jame and was until he broke free and reclaimed his soul, whose purity then immolated him.  (An echo of that old story Bane tells Jame in GS.)
Note:  Although Gerridon feeds on souls (one definition of a demon), he can’t benefit from reaping them himself or this whole puzzle wouldn’t exist. 
Possibility:   does Gerridon not have full direct access to any soul?  Does he need an intermediary?  That would play into the idea that, despite his ego, he is deficient.  I think, though, that Jame or the DW could feed directly if they were so inclined.  DW never wanted to; she was obliging her consort.  Jame has resisted it.  The DW gave Jame the gift of hindsight – do this and you fall.  Jame hasn’t, although tempted.
It sounds as if souls can be detached, but that doesn’t automatically give the reaper the ability to feed on them.
Hmmm.  This is still less defined that I would like.  My head begins to hurt.
Regarding the Shadow Guild, I tend toward Fir-bholg’s idea that they don’t know what they are doing (even with suggestions from Gerridon, who so far is clueless) and so can only do harm.  What they accomplish is the destruction of bodies and the subsequent freeing of captive souls, which isn’t what anyone in the Central Lands wants (different god system than elsewhere).
I have the feeling that I’ve raised more questions than I’ve answered.  Rats.  Still, you’ve set my mind in motion, for which many thanks.  Also thanks to Mindstalk for the spell check.