The canon 2015 Fact Files elaborate that TCW Sidious ordered Ventress' assassination specifically because if that version of Ventress grew any more powerful than she already was, her + Dooku would be enough to overthrow Sidious:
"Sidious knew that, should Asajj become any more powerful, the combined might of Dooku and Ventress could overthrow him."
-- The Official Star Wars Fact Files Relaunched
And indeed, Ventress was always growing in power:
"There was no doubt that Asajj Ventress was not only a powerful dark side Force user, but was growing in power all the time."
-- The Official Star Wars Fact Files Relaunched
So when Ventress tried to assassinate Dooku, she would be even stronger than before. Strong enough that her and Dooku were capable of killing Sidious. And Dooku was vastly superior to a stronger Ventress + Savage:
"Asajj Ventress and Savage Opress wage a combined attack against Dooku, whose abilities with the Force far surpass those of his apprentices."
-- StarWars.com: Video Guide
I.E., if Sidious is a 12, Dooku is an 11 and Ventress is a 2. Maul and Savage combined >>>>>>>>> Ventress. People keep saying that they're fodder to Sidious and therefore useless, but that's not how it works. 2 + 2 is still 4. Combined with Dooku, they are much better than before.
Sidious loses badly.
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