User blog comment:Maslab/On the subject of Noble Six/@comment-138261-20130708061632/@comment-1044705-20130708204454

If you want to argue individually about Vinh, Ajax, then I can point out that COMs may be failing due to either the explosion blocking off something between Vinh and Isaac, and the other Spartans. Or more likely, the Covenant simply jammed Vinh and Isaac's COMs with proximity. Since it hasn't even been confirmed that either Spartan encountered the Covenant, there are still too many variables to rule out survival.

But like I said, I only used Vinh as an example, albeit as an indication that there are many Spartans that may be dead but isn't for sure. Six, however, is definitely not one of them.