Halo didn't have alot of meaning unless you've read the books. If you did not you did yourself a diservice, because you are willingly leaving yourself oblivious to many things you could not know by simply playing the game. I will not argue, I will simply state he has little no no vocal cords left pretty much. If you want to know the answer to alot of questions I've seen, Read the book Crysis: Legion. Alot is explained there.
-Why the Ceph are called Ceph
-Why the Suit is Repairing Alcatraz
-Why the Ceph tech seems to basic given they can travel through stars
-Why do Ceph tactics and tech seems to similar to ours
-What really is the Virus they are dispersing
-What the Suit's Onboard computer aka "SECOND" really is, and how it behaves
-Why did Prophet Appeared at the end of the game in your mind
-What is going to happen to Alcatraz
-The extend of the Injuries Alcatraz underwent
-Why they are called Dead man walking?: Alcatraz was injured late night, yet Prophet was only able to take it off hours later and put it on you when the sun already came up. brain only lasts a couple of minutes after the heart stops
-How do Nanites replicate? How did they "heal" some of Alcatraz's wounds?. Nanites need a source of raw material to at least make copies of itself. Where do you think the nanites got the raw materials from if there is no action taken place outside the suit... means the materials to fill in your bones, spine, fix your nervous system had to come from inside the suit... what is inside the suit?
These and more I can't really recall are Answered there. Whether you want to speculate further on what you thinkn without reading it is up to you I guess.