I like the idea of a revealing backstory. Maybe how the Marine AKA Mjolnir Recon number 54 got to be whatever it is. Unfortunately this plot line would deal out most if not all of the Pfhor but I'm sure a bit of creativity could see them crossing an earlier timeline in an oblique way, thus sowing th...

There's a section in the Activision Bungie contract (https://assets.documentcloud.org/documents/357988/bungie-activision-contract.pdf) which talks explicitly about Marathon development. Admittedly it places some roadblocks, mainly the need for Destiny to make Activision $375 Mil before Bungie can li...