I alway took it that the Preds simply discovered them & started to use them- which is how the comics always told it.

The Sith Lords, however, stand a good chance IF (and this is a big IF) they stay far away. The image of Darth Maul is pretty much the end for him. Being that closely surrounded by aliens would mean he gives up and lets them eat him, or he starts slashing away with the lightsaber and gets bathed in alien blood (which any fan knows would equal death, as well).

From a distance, however (which a Sith can easily keep by using Force Push, sending all these warrior aliens flying off) the Sith Lords can use Force Lightning, hurl objects to kill the enemy, and even boomerang their sabers to slice away.

PS: You never see blood when someone is killed by a lightsaber. I’ve always figured its because as the saber cuts, the fact that it burns also seals the wound. If the same can work with a Xenomorph’s anatomy, perhaps Darth Maul CAN simply slice away and come out unscathed. Hmm. Either way the Sith win by a long shot!