system
Given the following post, respond as if you're commenting on Reddit:
human
[Gears of War 3] Why do Lambent Locust act like an organized army while Lambent Humans act like generic zombies?

Lambent Locust still use weapons and retain some semblance of organized infantry tactics, while Lambent Humans act like mindless zombies. Most of the Formers were civilians and not soldiers but they should probably still pick up guns and such.
gpt
Locusts have slowly evolved with lambent infection from former humans so they're a more "perfect" organism.  Something along the lines of 50% human 50% lambent DNA.  The infected locusts retain higher brain functions and can call upon former memories and such from this slower infection rate.  Formers on the other hand have a more virulent strain of infection that leaves them with little to no remaining human DNA and destroys all higher brain function.  They become more like ravenous animals attacking anything that is not fully lambent yet.  Essentially the entire system is like one large macro organism where lambent locusts are akin to stem cells and fill a specific function carrying the infection throughout the world  as needed and formers act more like antibodies and attack anything that's not a part of the greater organism.