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That is not actually true.
Prosperine Lore gives all psykers within the Thousand Sons army all the disciplines except Malefic Daemonology.
Two units have unique rules regarding their selection. Ammitara occult do not select a power and instead have Mind Killer. Sekhmet terminators may SELECT powers from the Pyrae or TK disciplines, but are not restricted to only those disciplines.
So you can either select powers from those disciplines, or generate them normally from any of the disciplines available to the Thousand Sons. This is the same way Lorgar can pick his powers out of Divination and Telekinesis, but must roll to generate Malefic Daemonology powers.
Regarding the Brotherhood question, that is not an ability that is conferred to the entire unit. It would make it too confusing anyway, since then technically the IC joining the unit would lose his individual psyker status and mastery level, and become part of the Brotherhood with whatever their mastery level was.
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