As the team currently stands they are not that strong. Have nearly all gear 12 and good mods. Even with 2 FO tanks the protection regain is trivial vs the damage output from opposing teams.
I'm suprised this isn't talked about more... crit immunity. Without GK's crit immunity toons get dropped too quickly. It's too clutch and basically necessary in today's heavy hitter arena.
Tried my Kru lead FO against new Rey meta team in top arena and frankly it's impossible to win. They desperately need new powerful and tanky members .. and probably someone who either provides crit immunity or some sort of decent passive damage reduction.
..and yes Kru's one major asset, the 2 turn stun, should be undispellable. Even this would only be a meager improvement in the current L'S dominate arena.