Can my squad improve¿

Yea get Darth nihilus unlocked and to 7* same with rest all to 7* drop maul hes a weak link do emp lead guessing emp zeta is unique? If so zeta lead sion needs a zeta then mod to be fast with some potency in there probably speed sets on all maybe not sion i used him with cd and health worked for me but aim for 10+ speed minimum if possible faster then should be good but will loose to jkr meta snd maybe bastila lead

The best sith team without traya is palp sion Nihilus thrawn and vader or badstila...I use zPalp zSion Nihilus Vader and zthrawn...you need potency on palp and lots of speed on everybody...i have 2 gear12 and 3 gear 11 and over 200speed on everyone my fastest is thrawn 254...i can hit somewhat like 200 or 150 with that team

Yes, like others said, get nihilus, change your leader and 7* all of the them. if you get thrawn use him as a fifth (palp sion nihilus vader and thrawn), if you don’t I think you can use bastila fallen, if you will be with this team in arena for a “good” time think of putting a second zeta on palp.