Originally Posted by
De Maffe
There's a world quest in Bastion that has you "train" to judge if a soul needs to go to the Shadowlands or not.
In this world quest, I have seen that they say "Oh Everyone, even this cute little dog, is equal and have to accept their fate and be judged". But then there was a Valkyr, I think, and then they say something along the lines of "Oh but they have their own thing, we don't take them". Or a demon and then it's said that "this one's soul will go back to the twisting nether" or something.
It's my believe that not "ALL" souls go to the arbiter. The "ALL" is just "ALL the souls that haven't got their own little thing".
Vrykul, Demons and those that worship Bwonsamdi seem to fall under that rule.
Bwonsamdi isn't a racist. He doesn't take care for your soul just because you're a Zandalari Troll or just because you're not a Zandalari Troll. The Darkspear Trolls also worship bwonsamdi. The Tortolan / Sethralis also worship Loas. In De Other Side, we see that even Gnomes can make a deal with him.
The Troll souls in the Maw are Trolls that didn't worship Bwonsamdi. And Kyrian's just don't ferry souls that have aren't destined to be judged.