I think that people need to get over the Chaos God's hating each other.
All everyone says is, the God's hate each other so they won't work together etc etc wah wah.
But the fact is they can and do work together at various times. It's called the Great Game, its eternal, they are always seeking an advantage over the other and more often than not that means promising x something so they can attack y together. Also they team up when attacking the material realm, as is indicated loads of times in the Chaos Daemon Codex. I mean look at what they did to the old ones in Warhammer, and those Lizardmen.
Also stop saying things like Khorne hates Tzeentch and Slaanesh because he thinks they are effeminate wimps (one because he uses magic the other becuase he ... kinda is effeminate), it's because they are a conflict of interests in terms of their desires and also sometimes due to an overlapping in potential souls.
Someone likes killing? They could easily be a Champion of either Khorne or Slannesh etc etc.
Chaos Gods are getting way too simplified IMO and it's starting to show badly.
Finally, Malal is just another form of Chaos, not it's true form ... oh the Chaos Gods are about killing, so killing everything including Chaos itself as well is awesome .... no, in it's original incarnation Malal represented Chaos' ultimately unstable and self-destructive tendencies. Oh and he wouldn't help the Imperium IMO.
Okay one more thing .... stopping voting for a rotting corpse you bunch of sissies .