First of all, the warrior is one of my all time favorite types of Alien(The FaceHugger being first). Second, I agree; if you think about it, Drone kind of makes them sound... well, I can't find a word. Anyway, Drones, if they live long enough, go under some kind of process, making them more important to their hive, giving them the name "Warrior". The Warrior, at first, was just a newer design to the Alien only supposed to be used in Aliens before the whole Alien Cycle thing came up.
Do you like Peanut Butter?