Regarding the spy inference. I would recommend saving it until after Holdo is revealed to be doing the right thing and that Poe was just impulsive. After all, we’re supposed to side with Poe and be suspicious of her until otherwise.
Also, it should be referenced that the First Order discovered their base on D’Qar and planned to fire Starkiller onto it (“They’re charging the weapon, again. Our system is the next target…”) to further reinforce the spy thing.