Lead engineer Brett Douville told Cinelinx that the two competing stories were developed by lead level designer Kevin Schmitt and creative director Tim Longo-Longo is currently the creative director on Halo 5: Guardians.
There were two potential stories, and one of them answered questions about a particular character's fate. Star Wars: Republic Commando released more than a decade ago, but a recent interview with the shooter's lead developer has revealed details of what a sequel could have been.