Okay I understand the problem now. I didn't know that undead teams never have an Apoth equivalent except for the temporary Igors you buy with inducement money. I thought the "Necromancer" is an Apoth equivalent, but he's different.
I do remember killing AI linemen, but I never see an additional skeleton joining my team? Do I have to remember to look in the "Purchase Players" after the match? Or does the game actively ask me if I want to raise a dead body?