the reasons are fine, except for the SM one. The emperor is too sacred to clone. that would be heretical, and i know thats why the GK are seperate to SM, but then they wouldn't be SM, they'd be CSM, because they'd be heretical. the general idea of them being good yet deemed heretical is fine, as that happens anyway, but cloning the emperor is just wrong. its unthinkable. have them *loose a battle and be expugned from the records*, but cloning the emperor is just unthinkable..
*this has happened several times and is a sound theory*