I would rather rework the existing ones and the Jedi that are close to them : Plo, JKA, Ahsoka, Mace, Aayla and GK with more synergy. GK is already good so let's forget him for this part. But all the others were generals during CW and none of them have good synergies. Even Plo who can grant TM, this is not what we can call synergy.
Plus, I would give Echo a zeta to let him reduce CD of the entire team when assisting. I would change Rex and Fives Leader into a Unique, applying to all allies. Still, changing Cody's first special into : applying Daze on every ennemies critically hit, non avoidable, would be better than a stun. And finally, giving effects on Echo's Special like Shock/Stagger/Expose (one or two of them, avoidable if more than one) and more effective on droids (EMP is technically lethal for droids so...).