I feel your Sidious missed the real opportunity here: hide the true Sith order even further in the shadows. Instead of taking apprentices (Ventress?) and have him/her pass down half-baked lessons to make potentially useful pawns, and at the same time creating a direct link between them and himself, what Sidious should have done is twofold:
- disseminate curated knowledge that leads headfirst to the Dark Side of the Force (from sith alchemy to old myths to simple shortcuts that leave you vulnerable to your emotions going wild), and disseminate it massively. Like at least a handful of such items (books? databases? carved tablets?) per habitable world. Bonus points if the items have part of the info missing to force people in a intergalactic "treasure hunt".
- fabricate either a fake "Captain Kesel" (or a dozen, or a hundred!) to spread either contradictory or just misleading information, or simply modify the original videos (with said fake info) and re-upload them far and wide. Basically: drown the information.
Heck, for a true virtuoso politicial beast, like Sidious is, the very first thought should have been "how do I control how, where and to whom this new world-changing videos are presented?"