xenos are pretty much wild animals, they can learn from experience, just like animals do, but it can't possibly live long enuff in the ship to learn to 'kill more'.
if u say a xeno like daveberg's character, well that's different, he's not a drone, he's an Alpha xenomorph who has lived many years. he'll be able to take down a couple but on their ship, on their terms, he wouldnt dare, he would be smart enuff to do that. yautja would be able to detect alien lifeforms its inevitable with thier technology. in that situation, its not a hunt, any weapons are available, including plasma caster.
Clan Balatu
Struggle is The Glory