So, I'm watching a tactics video for the future 'Nid army I have about half the models for, about 6 months old. The narrator pops out with "...and if you put the Neurotyrant in a squad of Zoanthropes, they can all take advantage of the Big Guns Never Tire rule, because of the Monster Keyword."
That...simply can't be right, my head-cold addled brain thought. That's not how that actually works, is it? Dutifully, I open up the Core Rules. No help (giant surprise there

), so off to the
FAQ files and Rules Commentary. In the KEYWORD section of the commentary is states very plainly:
--If a rule specifies that it applies to a model/unit with a KEYWORD, it only applies to a model/unit with that keyword on its datasheet.
--If a rule specifies that it applies to ‘non-KEYWORD’ models/units, it only applies to models/units that do not have that keyword. For example, if a rule applies to non-VEHICLE units, it only applies to units that do not have the VEHICLE keyword.
--Some units can contain models that have different keywords. While this is the case, such a unit is considered to have all of the keywords of all of its models, and so is affected by any rule that applies to units with any of those keywords. Remember that attacks are made against units, not models.
Then, after a somewhat pointless example, it immediately states:
--If a rule only applies to models with a specific keyword, then it instead only applies to models in such a unit that have the correct keyword.
How are these not directly contradictory?

Like I said, I'm a bit doped up on cold meds, but it appears to say:
1) If a rule applies to a unit OR model with a KEYWORD, it only applies to the unit OR model with that KEYWORD actually physically printed on its datasheet.
2) blah blah blah the opposite of the first one, essentially.
3) Now I can tack on a Leader (Neurotyrant) to a Zoanthrope unit, and the unit (note it doesn't say models, just unit here) is considered to have all of the KEYWORDS of all of its models. So now the Neurotyrant becomes Infantry, and the Zoanthropes become Monsters. Similarly, if I put the Tyrant into some Tyrant Guard, they suddenly all get to Fly, and become Synapse for the purposes of measuring the 6".
And then...and then...it follows that up with:
4) If a rule only applies to a model with a specific KEYWORD (such as only Monsters and Vehicles being able to use the Big Guns Never Tire rule, or only the Tyrant actually having the Synapse KEYWORD on their sheet, not the Guard), then it only applies to models in such unit that have the correct KEYWORD.
WTF?
So by all of that nonsense, the way I'm reading it is, a
unit gets all of the KEYWORDS of each model, which is usually a hefty
negative. I.e. said Tyrant and Guard are now subject to Anti-Psyker/Infantry/Monster weapons as a unit.
When it comes to a
beneficial special ability, KEYWORDS like Synapse letting you measure range from non-Synapse KEYWORD bearing models in the unit, or the aforementioned Zoanthropes using BGNT, it's a big nope.
Do I have that cogitated out correctly in my addled brain? What did I miss? Why can't the rules be clear?