But it's "fluffy," because Nids are going to end up eating the Cult eventually, and the Cult probably isn't so mindless that they don't know that. Survival instinct is still in there, and they're not going to want to get too chummy with the Nids. Also, they probably tested it out and realized using Nid abilities or attaching characters to units in the other faction led to some bad stuff.
They're "FAQs and Erratas." If they feel they messed up the first run of a set of rules, they reserve the right to edit or refine them via errata.
And the only reason they're "first draft" is because they're trying to make sure the wording is clear, not seeing if people agree.