Responses
100% there's a middle man. Or even two. Like to lessen the probability of one of the sides being in danger. There was the Russian(?) guy at the start. However, as I'm looking at this, it needs more strategic infrastucture. If you're killing people for money, the management agency which provides discretion and insurance would be better then your run-of-the-mill Joe-Shmoe

Isn't a major red flag if you don't know who's your Client? I mean u should at least know whom you're working for.
But maybe in this kind of work, most of the clients prefer to be unknown.