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I just read through this whole thing and Ive almost answered my questions:

DP with MOTz is mastery level 2
Aspiring sorceror with MoTz is mastery level 2

My questions is: do the DP and sorceror need to purchase a power for each replacement? so do I need to buy 2 in order to get 2?

My answer is this:
since ahriman is mastery 3, but has 5 powers, he can sacrifice all 5 of his given powers in the codex to utilize the psychic power generator[PPG] in the BRB. In which case he generates a psychic power for each mastery level until his mastery level is full. This is paraphrased from the 2nd paragraph of the 2nd column on p. 418.

Per the codex, a deamon prince must purchase 1 power to be a psyker, and with MoTz becomes mastery level 2(regardless of whether he purchases another power). Thus he may trade all his powers (1 chosen) in order to utilize the psychic power generator[PPG] in the BRB, which state that he must have a power for each mastery level (2 random).

Also, per the codex, an aspiring sorceror must buy 1 power, he is by definition a mastery level 2 psycher (as discussed previously), and therefore can opt to trade his codex given powers to utilize the PPG which states that he must have a power for each mastery level.

The rule that stands against this is in the eldar FAQ, which it should be noted, has nothing to do with the CSM FAQ. A farseer must purchase a power for each new power he wishes to generate.
My thought on this is that the CSM FAQ is a very bad patch job to bridge to a new codex, which will probably come after the next 3 imperial codexes.

Ignoring the eldar FAQ (which is warranted in this case), a Tz DP and an aspiring sorceror will get 2 new powers even if they only purchase doombolt. for the DP this works out to 30 points when you include the fact that the MoTz already costs 20 pts. And to be honest, for 70 pts, 2 powers is the least that can be done to make the aspiring sorceror worth his cost.

-Mark

Darn:
I just reread the CSM Faq. now I'm just more confused,

it has the same wording as the eldar farseer, in which a psycker may replace a power with each one purchased. this may be how the ruling works for the daemon prince, and any psycker with a familiar, but the Aspiring sorceror is still in question.

He must purchase only 1 power, but also must take a power for each of his levels of mastery...

I cant figure out how to resolve this... I dont think GW addressed this.

-Mark