Nightbeast , Turr and Soontir are not synergistic. They are self contained skills. The rebels have Garven, Biggs, Dutch, Lando, Jan, Kyle, Roark and a bunch of unique crew that make very interesting synergies. The imps have Howl , Jonus who I rarely see used, and the space hippo pilots who I see a bit more. And on top of the Rebel dominance in number of sharing abilities they have very long ranges! Howl and Jonus are range one so you are forced to stay tight. That will be much more dangerous with munitions failsafe around the corner.
You are forgetting one of the best action giver of the game: Darth Vader+Squad Leader.
He has 2 actions, by giving one of those to a teammates in range 1-2, he's doing what Dutch, Garven, Kyle, Lando or Cracken is doing, but in his own style. Instead of being only a TL, or a focus. It's an action, so the receiver can do whatever he needs to do, and since Vader is PS9, pretty much everybody has move so you have a clear view of the field. He's also very resiliant with 3 agi and 5 hit points so won't get destroyed soon. Also, if he,s left alone at the end of the battle, his pilot ability is still badass, you only lose the 2 pts you invested in SL. Compared to all the rebel ones that as soon as nobody is there to receive the token, just become regular pilot with a high PS.