wow I read this thread and some of the posts man....
Do some of you actually read the background or just make up stuff to justify your argument on the fly?
we have written and acknowledged fordeworlds in the eye
We have traitor legions opperating AS traitor legions
We have Warbands with empires larger and more powerful than Ultramar
At the same time we have warbands that barely scrape by with limited supplies and poor equipment
But what we know unequivocally is that regardless of all this, the chaos legions are one fo the most dangerous threats to the imperium, likely surpassed only by the Tyranids, and we know that because GW spells it out in almost those EXACT words.
We are told that the Chaos legions have the power to topple the imperium, that means they do.