the Witch Doctor is not a Cult Leader...

the Witch Doctor is a bonus that you can be lucky to get if you convert a Doctor (and the option is enabled)

starting the game with only a Witch Doctor would be a bad game start if you want a good Cult game... make it a normal Cultist and enabled the Doctor's option

if you are only complaining because you want a Witch Doctor win... then make a setup that start with a Cultist AND a Witch Doctor