Originally posted by Lord Melkor
Well, as I see it, Sith seen in films are extremally powerful. Even Aprrentices, like Maul or Dooku, are beyond the power of most Jedi Masters. So I could see Emperor or Vader having few not powerful cultists around, as long as they are signiificantly inferior to them. You could even use a force users without the Jedi training, like that Bureau guy that hunted us in Darkside game, was able to sense force users.And without Luke around, and Vader hating Emperor, and knowing he can`t take him, him training apprentice for help sounds reasonable.
Maul was just a Swordsman! And Count Dooku a Jedi Master when he took the job.
Anakin was only a Knight when Sidious took him on. The Apprentice is just the one who is not the master, there is no actual statement of how powerful that person is!