B: Reapers have to be mostly intact for indoctrination to work correctly. (That would make sense, Indoctrination involves manipulating electric fields and infrasound, it's not just "space magic" that can emanate from any Reaper tech, it needs dedicated hardware to work.) Since Sovereign was broken into pieces rather than left relatively intact like the Leviathan of Dis or the derelict Reaper, it wasn't able to use its post-mortem indoctrination abilities.
I seem to remember that even small pieces of Reaper hardware could be dangerous for organics? There were several instances throughout the trilogy where organics seemed to treat Reaper remains with great care and artifacts were often contained in order to protect scientists against indoctrination.
I don't think a Reaper have to be intact in order to have an effect on organic minds. However, I guess a non-intact Reaper couldn't directly facilitate the indoctrination process, such as in the case of Sovereign indoctrinating Saren.
Why do you think that the council are so useless? Reaper indoctrination is the answer.
Unlikely, but interesting.
Looking at the Reaper issue from the Council's point of view, there's really not much that they can *do*, which is why they don't do anything. They need evidence and a practical course to follow before they can commit to action.
The Council gets all the evidence they need that there is a threat in Mass Effect. But because Mac Walters and Casey Hudson didn't want to tell the story along the lines that Drew Karpyshyn started, because they wanted a more action shooty game with Commander Shootmons and more TV soap opera drama, they hit the giant reset button at the beginning of Mass Effect 2 and hammered it a few more times just in case, in order to destroy the previous course of the story.
I agree that the council couldn't just start a massive interstellar re-armament project without conclusive evidence of a Reaper threat.
The last part is depressing if true. I've heard it several times before that when DK left the project, the franchise changed direction.. and not for the better. This underscores the importance of having a really talented writer on-board and actually allowing them to complete their work. The Mass Effect trilogy would've been even better if DK hadn't left the project prematurely .