Who is in control of the situation over there? Who is "taking care" of the rebels? Do you think they really have as much information and choice as we do? They think they're trying to survive and under constant threat from the Assad regime.
Here's the deal: Why would Trump employ Cohen for years if he didn't trust him? They have surveillance in the building, and I'm certain it's a lot better than the bad actors are expecting. They would let Cohen know what was going on.