[@FinDragon]
Although I don't really enjoy the idea of a constant lone survivor, I suppose that can happen in the 40k universe.
And lone wolves who disobey orders do not live long in this setting. Usually court martialed by some high-riding ranking officer, or executed on the spot for well, disobeying orders, by a high riding ranking officer.
Also, you mentioned a Chapter of Space Marines denying him entry into becoming a Marine, which Chapter of Marines denied him? Just curious.

[@Marcus XVI]
So your Commissar is basically carrying a C'tan Phase Blade. 
Crazier things have happened.

Unfortunately both of you failed your lore-check, but it's a silly test anyways.
Marcus, move your sheet to the Character Tab, Fin, we're gonna have to talk about your sheet a little bit more.