In the Thursday War, its stated that huragok(Engineers) are on the Infinity, and are responsible for a lot of the advancements they have. Where are they in Halo 4?
I may be answering my own question here, but maybe in the 3rd book in the trilogy, something happens to the huragok, killing them?
[Edited on 12.09.2012 12:14 PM PST]
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I think after the incident with Jul and that engineer, I don't think the humans are trusting the huragok that much anymore. They probably keep them away the action and just have them improving UNSC vessels, weapons, etc. Especially, since the appearance of a Forerunner, something they have been waiting for awhile.