No.
The Sith are probably the strongest faction in the game and Maul and Savage not only have zeta abilities, they have two of the top 5 zeta abilities.
If the game were being designed from scratch, I would agree. As it is, you can't take anything away from either of them or people will scream bloody murder. But if you add something without taking anything away, you're just making two of the strongest toons in the game - both from the strongest faction in the game - that much more powerful.
Again, no.
Plot wise, it's a great idea. Characterization wise, it's a great idea. For this game as it exists, it's an absolutely horrible idea. When all the other factions catch up to the Sith, then maybe you can contemplate this bit of power-creep. In the meantime, I vote no. A thousand times no.