Reanimation - is it worth it for non-Ermor nation?

[Corwin]

I haven't played much as an undead nation in Dom2, so I don't have much experience with reanimation. Now I am trying Yoni nation, and I'vve accidently noticed that some troops with priest level can reanimate (despite being holy, not unholy priests). I think it makes sense because they are demons.

However, Oni only have lvl 1 priests. I've tried reanimation in two provinces last turn, one with 1 1-lvl priest, and in another with 2 1lvl priest. The resuslts were strange.

I expected to have 4 ghouls and/or 10 soulless in 1st province and 8 ghouls and/or 20 soulless in the 2nd province, according to the table in manual.

What I got instead was 5 ghouls in each provinces. However the population losses were twice as high in the provincce with 2 priests doing reanimation (-100 pop) than in the province with only 1 priest. (-50 pop)

It didn't make much sense to me. Is both pop loss and number/type of troops somewhat random? And do you think it make sense to do it with 40gp 1 lvl unholy priests of YONI, or is it waste of time and as well as loss of your own long-term income from population?

Finally would reanimation works better if there are corpses in the province? If so - how much better?