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While i don't think the point was ever really clarified by anyone official, the most common interpretation is that Warriors can serve as an HQ choice OR as an Elites choice.
Most people I know don't bother burning an HQ choice on them (we have Tyrants for that), but in games too small to field a Tyrant, they make passable leaders.
So, yes, you could take two broods as Elites plus lictor(s), and then a Tyrant and the other Warrior brood as HQ.
...or you could do what I do and field two broods of nine Warriors, Two Tyrants, Three Lictors, a third brood of Nine Warriors with Venom Cannons as HS alongside the 'Fex and the 'Thropes, and six broods of 'Stealers as Troops, but that's probably a little overkill for most people.
you might not have much space left over for troops after getting all those guys!
Warrios can be taken as :
1) An HQ choice.
2) An Elite Choice
3) A heavy support choice (if more than one has a vc/bs)
4) A fast attack choice (if they have wings or leaping)
Basically if you want to work it, you could have the all warrior plus troops army.