> The IRGC and Basij effectively do not have a chain of command

There is no reason to believe that

They have been training for decades for exactly this sort of war, and have experienced veterans at all levels

If anything islamic countries never lack, its hierarchy. Endless, suffocating hierarchy, with all levels frozen in fear of the higher echelons. Then there is the clan-element. Certain families, have certain generals, whos underlings are of the same family, all the way down.

One has to abandon the view that what represents to the media as a modern state, with modern institution is actually a state. What you have is several, small states, city-kingdoms basically, ruled by one clan. Connected to one another in a tangle of agreements and contracts. Once you come to this point, you start to understand the structure of the thing and also why it is hard to decapitate.