Zombie should be left alone. A weak low geared zombie is a form of strategy that allows Dakas unique to be triggered more often making NS stronger.
Even kozispoon said it’s a strategy and not a bug.
https://forums.galaxy-of-heroes.starwars.ea.com/discussion/153504/fix-the-nightsister-zombie-gear-exploit#latest
I look at it like this...every toon in this game requires max gear to get the most out of them...why not just leave zombie alone..we all know just how much gear it takes to max to g12. Having a toon viable with green or blue gear is a nice change.