Simple really, do you have to include a model with the 'leader' or 'drone controller' ability as your leader or can you nominate anything as your leader? I realise there will be benefits to using a 'leader' leader but just wanted to check.
Similarly, can you include multiple models with the 'leader/Drone Controller' ability?
You can pick anyone as your leader, as long as he is 'eligible' (for instance, you cannot pick a Slave with the Matriarchy slave permanent ability).
And you can field as many Controller drone as you like, providing you don't exceed the points' limit of course (remember, 100 points is the most balanced type of game).
Feel free to ask absolutely anything, it will help us finish the english FAQ

And, for beginners, be sure to check the 'Preparation phase explained' answer :
here, it always worth an eye

Cool, just wanted to check. I'm picking up ISC first (and probably Bamaka Clan in the new year) and since they're somewhat limited in numbers just wanted to check I can mix and match at my leisure!