I have been thinking of trying to paint a few Alpha Legion miniatures, for 40k, but wonder if I want more uncorrupted look, and mixing in older marks, MK2-5, mixed some with ordinary CSM armor. Alternatively have some full old style, some full CSM armor. What is most appropriate for them? And what is lore appropriate of the Demons and chaos warped, tainted and possessed vehicles and CSM troops at the moment? It used to be, they were only using demons if cultists summoned them, do that still hold, in the fluff?