/facepalm
penguin the Holy Sword is the Gran Centurio. It looks nothing like the Einherjar. For one big reason: The Gran Centurio is a big huge two-handed sword. The Einherjar is a one-handed thunderbolt-style sword.
No.367 may be as Feral says... A experimental angel. This is again going largely into assumptions, but those 'extra' levels may be only if
» Click to show Spoiler - click again to hide... «
you decided to initiate Ragnarok. So they may not be canonically correct and so the levels were added in to a sort of AU arc.
So going off that...
You could then assume No.367 is a experiment into trying to develop a more powerful angel to fend off the invading human army. Going further off that you could then assume the Gods will eventually sacrifice themselves to create true Grim Angels.
Again this would be pure speculation and is more then likely not what is canonically meant to happen.
Although who the guy in the white hat and coat is though is really a mystery. I think someone said his name was like 'Heaven Soldier' or something.