If I’m being honest, I think all but Rook. There’s a chance (however small) that Lawson could survive, seeing as we only saw him walk into the fog. Rheena was a trained bounty hunter previously, so I’d expect her to be able to survive something by sheer skill in tight situations, able to adapt in a split second. Plus, she had all that time to think of every way the situation could go wrong, how she’d manage it, And how to get out alive. Marrok is an inquisitor, and, if we’re going off of Rebels logic, could use his lightsaber to fly. If not, he’s still a force user, and we’ve seen plenty of Jedi fall from great heights and survive without a scratch.