system
Given the following post, respond as if you're commenting on Reddit:
human
[Aliens/Gremlins] It's been speculated already that Gremlins had an alien origin. If so, could they potentially have been created as a countermeasure against Xenomorphs?

Whether or not the Engineers themselves were involved is debatable, but when you think about it a Gremlin's ability to rapidly reproduce without limit along with their instinctual drive to intelligently understand and emulate other life-forms they encounter in their environment (as evidenced by their somewhat comedic attempts to assimilate human culture - but now apply that to a brutal Xenomorph infestation as their sole influence) we may actually have the perfect bioweapon response right under our noses. The small size of the "larval" Mogwai form may well be below the implantation threshold allowing their numbers to grow exponentially with minimal loss. After gestating to their larger aggressive form they are capable of reproducing directly to the evolved state thereby avoiding the delays of a complete gestation cycle. Even their intrinsic weakness to sunlight could be intentionally engineered - to provide an easy method of eliminating them using solar radiation after their work has been done.
gpt
From the novelization: 

"The galactic powers ordered the Mogwai sent to every inhabitable planet in the universe, their purpose being to inspire alien beings with their peaceful spirit and intelligence and to instruct them in the ways of living without violence and possible extinction. Among the planets selected for early Mogwai population were Kelm-6 in the Poraisti Range, Clinpf-A of the Beehive Pollux, and the third satellite of MinorSun#67672, a small but fertile body called Earth by its inhabitants."

Of course, it was later discovered that only 1 in 10,000 of the Mogwai retained their intended benevolent disposition, and (the galactic powers believed) the species was eradicated.