So how about this for the Holdo scene? This way, she isn’t directly stating that she suspects a spy, but Poe is still able to interpret it that way:
“Our plan… Captain? Not Commander, yes? Wasn’t it Leia’s last official act to demote you? For your Dreadnought plan? Where we lost our entire bomber fleet?”
Poe, astonished, found himself at a loss for how to defend himself. “Captain, Commander, fine. I just want to know what we’re doing.”
But Holdo wasn’t finished. Her eyes bored into his.
“Of course you do. Unfortunately for you, it is a need-to-know plan, and you are no longer an executive officer. So until security concerns are cleared, I suggest you stick to your post, and follow my orders, Captain.”
Holdo turned around, but now Poe was worked up. She was suggesting that somebody in the Resistance fleet was leaking their position to the First Order - and that was how they were tracking them through hyperspace.
“You dare question my allegiance to the Resistance?” he protested to her back. “After my parents sacrificed so much?”
Holdo swirled back around. “I never suggested such a thing. You’re a liability, flyboy. Impulsive. Dangerous. The last thing we need right now.”
And with that the new commander of the Resistance stalked off, leaving a stunned starfighter ace in her wake.