[Q] [Ermor LA] Generated undeads & Co

[QXel]

I have a question about the undeads generation in the province with forts.
Does the type of fort matter or just the Dominion level ? For instance : do I keep a just conquered fort or demolish it to build an Ermor fort at its place ?

More : in which way the Dominion level seems to influence the numbers and type of undeads you get ?
I have many many forts in provinces that are all at the max of 10 in Dominion level (SP game, don't worry ;o), but it seems that I don't get the same type, number, etc. of undeads in each of them. There is a lot of difference, I mean ! Not just one or two Velites more or less ... Sometimes I get several Holy Undead Horsemen (I forgot their name, sorry - chevalier of the sepulchre ?), and sometime none of them ... well it's seems pretty random, which it maybe exactly what it's intended, but didn't knowing that, I ask.

Same question apply with the spirits generated by Soul Gate, obviously ;o)

And same thing for the undeads Commanders generated (Mound Kings - on horse or on feet, Censor, or Shadow Tribune w/ Soul Gate) :^DD

Thanks for any experience feedback.