*Possessed are troops.
They would still be useless ...
I've posted my "wishlist" for Word Bearers before but a few things I would like to see (note that this is just a big list - we wouldn't necessarily need to get all of it):
A revamp to the Apostle so that the Word Bearer's version is more like the actual
DAs in the books (basically a cross between a Chaplain,
CSM Lord and Sorcerer)
An ability that would allow you to take certain units from the Demons codex as though they part of your normal Force Org
A spell to allow you to possess (basically just replace) one squad of cultists with a squad of Demons of the same mark (or a random squad of demons if the cultists are unmarked)
An ability that would allow you to take certain units from the
IG codex as though they part of your normal Force Org (pretty sure this would have to be mutually exclusive with the demons version. You would have to pick one or the other but not both)
Gal Vorbak:
Basically they would replace Chosen and have better profiles and weapon options to represent the Demonic possesion
These are just a few of my favorites. My group and I were actually drafting rules for these at one point but my fellow
CSM players have kind of given up for this edition.