[MidnightSun]

Otherwise I see the Grey Knights being totally outmatched especially against Angron

Eheheheheh

 

[MidnightSun]

I originally thought about that - but if all it took would be 8 Grey Knights (it's not clear if they were all Terminators or not) to kill Angron, who is one of, if not the greatest, of all of Khornes followers, then all it would take is a combat squad of grey knights to cut through a full fledged warp tear.

Eh, they only banished him, and it wasn't even for that long.

I like it. Angron as a Daemon Primarch could walk through absolutely anything the forces on Armageddon could throw at him other than the Grey Knights, whereas if he were just a regular Primarch he would have been far less vulnerable to the Grey Knights but more vulnerable to the battle cannons and vulcan mega-bolters of the Imperium.