Well not even that, Drenton, a warrior is just an older drone in general, which leads to a fact which I find to be so intriguing: Xenomorphs have no real "normal" form. So far the majority of the xenomorphs which we have witnessed are human-spawned because humans played a role in the films, but that does not make human-spawned xenomorphs the most common type out there.
In other areas of the fictional universe there could very well be another set of organisms being terrorized by xenomorphs, and those drones would look entirely different and still be considered the most common to the invaded populace.
This also leads me to believe that there is no set size limit for a xenomorph. If it gets a big enough host, assuming that the sheer size would be beneficial for the xenomorph, the chestburster would adopt the genetic coding to make itself that large. Of course, xenomorphs are typically stealthy, so this wouldn't exactly be a very common incident, but it could happen given the right scenario.
So, to put it simply, xenomorphs really do live up to their name: they are just "alien forms," with no set common appearance aside from the basic xenomorph structuring. ^_^ So cool.

"If anything in this life is certain, if history has taught us anything, it is that you can kill anyone." - Michael Corleone