[@Necroes] I get all that, but you are playing a different RP than we are essentially. You are playing an ultra-powerful top tier character (eg Chaos lords, Chaptermasters, Warbosses) who could ruin battlefields singlehandedly and more devastatingly than anyone short of an alpha level psyker or battle titan. In your CS you even said you could brawl with nobs and small warbosses. and have mastered a [s]dozen[/s] Ok, 5 but still... psyker realms of study that usually take a single psyker a life time to master. Even high level sanctioned psykers or librarians dont have that many skills. 

You are playing a power fantasy game while we are playing an "against all odds" game, at least for the moment. Most of us could not fight an ork nob single handedly, even lucius and Xeph would have a hell of a time with it. Oskar would die (which is fine, i knew he would be reletavely weaker) and the dread mage would die even harder than Oskar assuming he didnt magic his way out of it. 

Oh, as for fluff, i take liberties with the fluff too. Im sure everyone does, but we dont need to find archaic notes in the fluff to justify an interesting story or vastly extrapolate in a way that we want that simply doesnt make sense. i think the biggest example was the chaos spawn slaves as nobody had the materials on hand to make them or the know how but that was ignored for the fact that it would just be interesting.

Finally i still dont know why the ork was allowed to follow us at all. the ogryn didnt kill him because, well killing PCs is generally not well recieved and the character was following lucius dumbly and lucius didnt do anything about it so, meh. Everyone else though should have been directly hostile to the unknown Ork because i thought they where kill on sight for basically everyone due to spores (and yes i know he doesnt but literally nobody IC does). Oskar will behave this way, and will try to kill the ork as soon as he is given an opportuinity unless he is given a [b]very[/b] compelling reason. Any imperial soldier would act the same and does not want the ship taken over by ork spores. (again, exactly nobody knows the ork does not give off spores)