First.
To the people who are complaining about the 2014 release, it’s perfectly fine. 343 has a massive development team and they’re easily capable of making a AAA game. Don’t worry.
Also.
Many think MC is running from ONI/UNSC, could be true but I think he could be trying to take Cortana’s chip to some place to get her back and he was wearing the robe to protect his armor that had plenty of cracks in it.
Getting Cortana back could be the plot or semi plot of halo 5.