Your making a point, but what about the "Fear the Six"
By "fear the six" i assume you mean the words written on the walls in some zombie maps. Most people beleive its because the nova 6 gas. I personally beleive that its because dogs usually come from rounds 6-8 and dogs can not come before round 6. So by saying fear the 6 they are saying fear the six.
And maybe (RAISE HELL) is related to call of the dead because the boss is almost impossible to kill.
Also (FREEDOM) may give us an idea of the next zombie map. Maybe your not ever in a building, and the next map is a PURE outside map with no buildings? i guess we will find out.