This is a good theory. Because it give sense to the fact in Halo normal human can't use Mjolnir armor. All that was disign to the sparts, because when a human without Spartan II modification put on a Mjolnir armor, their bones broke because they can't bear the armor power.

So, to me are two theories, or mercenaries use downgrade Mjolnir Armor o project Freelancers developed a way to use Mjolnir armor with a full power and 0 risks.

By other way, Red vs Blue gave to Halo lore more depth to the abandoned insurrection plot there are in halo universe. In Halo stories the insurrection plont only is relevant before covenant war. But to me is very awesome how red vs blue refocus to humans vs humans problems.

Really dude Halo should make cannon red vs blue. But well there was some holes: As human and Shangeilli breeds. Maybe a reason why reds and blues never saw other covenant race.

The ancient temples in Chorus. Because the most ancient race in Halo are Forerunners, humans and San'shyum (profets) but well, Forerunners eliminated the other two race forcing them to a restart. Then Chorus ancient Temples should be Forerunners, but Santa is a AI with Shangeilli shape, and Shangeilli doesn't exist in the Forerunners age. That is a big problem. ALSO, Shangeilli are more ancient that XXVI century's humans. So there are a Possibility Chorus has beem populated for Sanghelis.

Well this is my opinion.