No. Only works for Daemons with the "Daemon of Nurgle" rule. Which, in the CSM codex, only Daemon Princes can have. All others simply have Marks. And Characters from both codices still can't join each others units.
They certainly made damn sure that, after recently introducing allies, the most logical pairing in the background can't interact much with their respective (only) battle brothers. It's completely puzzling to me. A Space Marine can lead a squad of Guardsmen and give them ATSKNF (lol), but a Khorne Lord on a Juggernaut can't lead a unit of Demonic Juggernaut riders...
Thats because Space marines are overpowered. Everyone knows that!
Evil/Xenos armies always get the shaft.
I am certainly leaning towards making Daemons my main army. Despite army wide nerfs, especially on Bloodcrushers, Flamers, Tallyman, Changeling and Masque, most of the rest of the book is okay. Its mostly due to the insane cheapness.
Now since this was my thread initally, I am threadjacking it to post my first try at a 2000pt list. Its not ideal, since it is quite slow, so won't probably see battle, but see what you think;
Fateweaver
Herald of Tzeench, level 3, Grimwoire of True Names, Locus of +1str spells [thats not what its called, but thats what it does!]
20 Pink Horrors, Icon, Blasted Standard
20 Daemonettes, Full Command, Greater Etherblade
20 Daemonettes, Full Command, Greater Etherblade
20 Bloodletters, Full Command, Etherblade, Banner of Blood
10 Plaguebearers
10 Plaguebearers
Soul Grinder, Mark of Tzeench, Eyebolt ability [s10 ap1 18 inch range gun]
Soul Grinder, Mark of Tzeench, Eyebolt ability [s10 ap1 18 inch range gun]
Seeker Chariot Cavalcade [2 seeker chariots, 1 exalted chariot]
2000