Banes feats place him around Shaak Ti/Qui Gon level with marginally impressive lightning. Gideon believes quite paradoxically Sidious is the most powerful Sith but would lose to Kas'im in a Lightsaber duel. Given Gideon's reputation as inconsistent, it'd probably take between 8 and 10 Banes for ROTS Sidious and 15 for DE