Think about this

forge and custom games are in infinity in halo 4 right? Infinity controls war games right? Now what if forge and custom games are cannon? So in their spare time Spartans create custom games and forge maps to test and train on. Think about it custom games train you to to do certain things and forge maps do the same; who knows 343 please explain

I wonder why Spartans are so found of teabagging each other then…

Shrug

That also implies that a Spartan can change into a forerunner monitor on command.

As a part of forge “software” or some -Yoink-