My army is fluff based but I made up my kabal and cults and etc.
My witches are being painted their own cult red color. Kabal its own gold color. Haemonulie coven has its own color. Incubi temples its own. Reavers will all be unique with battle scars because they don't have an organization and I may do the same for the scourge, if I don't then the scourge will look like haemonculi coven colors. And so on...
I certainly won't judge u. I think its great to make and change your army to fit fluff and fit your own fluff. (I think that word fluff is getting used too often :-) )
15,000 Dark Eldar