Did Sidious want Ventress killed b/c he was legitimately afraid of her plus Dooku?

Did Sidious really fear for his life or was he just testing Dooku? Or was there another reason for it?

Considering he was fine with Vader training Galen, I'd say it was more of a power play by Sidious than anything else. Something to put Dooku in his place so to speak.

Precisely. 👆

I mean though the Galen thing was planned between Vader and Sheev apparently, Sidious let it happen despite the possibility of Vader deciding to follow through on the otherwise lies he told Galen about what he was trained to do.

And Vader and Galen as a duo are definitely more of a threat than the Dooku Ventress duo

Even without Galen, Sidious being so worried about a minor thing, or even if he was sincerely worried, the straight and fierce way he handles that dialogue seems out of character to me. It's a long term lesson, to put him in his place, as you've said.

Yes. In that alternative reality where Talzin enhanced Ventress instead of Savage she grew more powerful than Dooku.

Two Dooku-level opponents would prove too much for even Darth Sidious imo.

Originally posted by Emperordmb
I mean though the Galen thing was planned between Vader and Sheev apparently, Sidious let it happen despite the possibility of Vader deciding to follow through on the otherwise lies he told Galen about what he was trained to do.

And Vader and Galen as a duo are definitely more of a threat than the Dooku Ventress duo

Originally posted by Lord Stark

Two Dooku-level opponents would prove too much for even Darth Sidious imo.

Originally posted by Sinious
I highly doubt that.

In new canon, I believe so. I believe the Emperor felt that the two of them could one day be powerful enough to beat him. The reason why he wasn't concerned about Savage and Maul, is because he had trained Maul and knows his style and he senses Savage is a newb.

He was so unworried about Savage and Maul, that he went and handled it personally. Yep.

Originally posted by Lord Stark
Yes. In that alternative reality where Talzin enhanced Ventress instead of Savage she grew more powerful than Dooku.

Originally posted by ILS
Huh, that was a thing? Got a screencap or something?

I don't have a screencap, but I remember seeing it in one of the Clone Wars magazines. Ventress is powered up, given a set of new armor, and kills Dooku. Sidious then christens her Darth Vindicaa

Wait, why didn't Talzin power up Ventress, lol? Seems like the most logical option.

Also, Darth Vindicaa sounds badass.

I think I found the part of the magazine y'all are referencing though: http://38.media.tumblr.com/1a7d66bda3b05fdd2ec6e6d678a58075/tumblr_inline_n3qvbecahr1r6cutm.jpg

Same reason Yoda would tell 2 Jedi to go to Malachor, an incredibly dangerous world and a magnet for Dark siders.

The bad-assery of Sidious in this scene is impeccable:
https://www.youtube.com/watch?v=Faz3aNUfMFQ

Originally posted by |King Joker|
Wait, why didn't Talzin power up Ventress, lol?

Because her true intentions were to revive Maul.

It's mostly that they have the potential to cause trouble if they rebelled, particularly because of their knowledge on the CIS and his identity. He's not afraid of confronting them in person, obviously. In such a confrontation, they wouldn't pose more of a challenge (or lack thereof) than Maul and Savage.

Originally posted by FreshestSlice
He was so unworried about Savage and Maul, that he went and handled it personally. Yep.

He wasn't worried about their abilities or powers as individuals, I think he was more likely worried about the military/overall threat they were becoming.