JC is great for GW with his short heal cooldowns,and his chance to decrease them by 1 with his basic (a lot can happen between Lumi cooldowns). Barriss's node is 6-A, otherwise she has hard nodes but that's a super slow farm better suited for other toons with no "fast farm".
Her heal is amazing unless your squad is all at low health, but her leadership ability is amazing and her passive gives the chance to dispel any negative status effects. Pretty much makes Sid trivial.
Ahsoka can hit like a truck, and she's even better now that they changed her special so that she either heals if above 50% or does mass crib damage if below. Used to be she only group or self healed on a fit.