The first time i read this it made sense to me until other people started saying it didn't work that way. So I would be grateful of some clarification on how people came to their conclusions.
"Psychic Focus
If a Psyker generates all of his powers from the same psychic discipline (even if he can only generate one power), that Psyker is said to have Psychic Focus, and gains that discipline's primaris power in addition to his other powers."
Ok so if you generate all your powers from 1 discipline you get the primaris for free.
"If during the course of the game, that Psyker gains a psychic power from a different psychic discipline, he immediately loses Psychic Focus (and the associated primaris power) ."
If you gain a power during the game you lose the primaris and do so before the game. So far so good.
"Generating Psychic Powers
Psykers generate their psychic powers before the game begins. ... Otherwise, a Psyker generates random psychic powers from amongst the psychic disciplines known to him. ... To randomly generate a psychic power, first choose one of the psychic disciplines known to the Psyker. Then, roll a D6 ... If the Psyker needs to generate more than one psychic power, repeat"
So a psyker only generates powers by rolling for them.
So where is the restriction removing psychic focus when you gain chaos psychic focus? if you generated all your powers (rolling) on one discipline you gain psychic focus. You gain chaos psychic focus automatically and not through generation. And you don't gain it during the game ("that model automatically knows the primaris power of the discipline that corresponds to their patron deity").
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