Most disappointing Brother Honsou, must you deride the Great Composer. How can one orchestrate a great siege without delving into the realm of Tzeentch. Of course dealing the powers he offers are dangerous, like fire, one must expect to get burned from time to time.
He has no honour or glory in his cause, and he favours distrusting magic instead of martial prowess and supremacy through firepower and strategic dominance. I do respect him and his soldiers as allies that will join us in crushing the armies of the decaying Imperium and the False Emperor, but i feel nothing more than that
The pursuit of knowledge and arcane power is an altogether different pursuit than things that can be measured in honour and glory, that part is up to the application of said knowledge. I will partially accept your opinion as our goals are mirrored, but Strategic Dominance is very much a Tzeentchian principle, as what is stradegy but a battlefield conspiracy. The best strategies involve deceit, guile, and tricking the enemy into making the wrong move. Also, we value firepower, just in our case it is the literal power to wield fire.