Man, I seem to have a lot of rules questions coming up this month!
So reading the Command Benefits p120 (Ideal Mission Commander & Objective Secured) I noticed that you get them for using the Combined Arms Detachment and/or Allied Detachment p122.
No mention, that I saw, in regards to Battle-Forged or Unbound p117.
So the following Unbound army:
Sisters Primary CAD
Space Marines CAD
Inquisition Detachment
StormLord (Astra Millitarium Lord of War-makes the army unbound)
The Troops in my Sisters and Space Marines should still have Objective Secured, correct?
If I'm missing something, please let me know!
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One sentence...p117 under 'The Primary Detachment' last sentence. "...in an unbound army, these models are not bound by any Detachment restrictions and do not receive Command Benefits."
But I think that is assuming you are not using any Combined Arms Detachments.
I didn't see anything in Unboud that doesn't allow CADs or that only Battle-Forged can use CADs.