Its the look that they have. R2 looks the same everywhere so he gets all the tags. Ventress however looks different as a bounty hunter so shed need a different toon for that kit.
Ventress however is not a sith, she does not practice its beliefs. She knows sith but she herself isnt one, using a red saber is not enough to qualify. Savage gets it because Maul (whi is a trained sith) attempted to train him properly and was an official apprentice to counter Palpatine under the rule of 2. Ventress knows nothing of how the rule of 2 works and thus is not a current sith
