[quote]1. What exactly was the compound, and how exactly did it come into being? Why does it only target humans, and how does the Covenant Zealot utilize it?[/quote]Current UNSC understanding of the element is that it was created from the extreme explosion caused by the Pillar of Autumn's reactor going critical. It works by latching onto human DNA and randomly compiles it, preventing your blood from carrying oxygen. In order to disperse the element over such a wide area, the Zealot utilized a device that uses Halo's technology to disperse super-massive neutrinos, only now, its dispersing the element. [quote]2. What happens to Locke and[/quote]Locke went on to become a SPARTAN-IV and continue working for ONI. The other survivor is speculated to have joined him. [quote]3. What was the significance of the final second story? It seemed it was important, but I didn't get any of it.[/quote]It is implying that significant amounts of the element still exist, despite the source of it being destroyed. [quote]4. Why was the Lekgolo buried?[/quote]That, is a very good question. [quote]5. Why was the Lekgolo different? Like, attracted to technology and all.[/quote]It's a different colony formation suited for a different task than the Mgalekgolo.