Brother from my phatichar understanding of Iranian military war-fighting doctrine, this is due to the very system they employ known as دفاعِ موزائیکی.
The Iranians studied the 2003 Iraq war and came to the conclusion that a unified centralized command authority is vulnerable to a direct attack or elimination by a highly organized enemy attack.
As Iran faces multiple threat actors, they developed this decentralized command doctrine with provincial independence, pre-delegated authorities and successor protocols to ensure the survival of the command and fighting force. It has worked out well for them.
So, I think it is unfair when people say Iran doesn't have a chain of command, it very much does, it's just not how traditionalists would envision a chain of command per say.
Just like any country you have different factions with different opinions on how things should be done, Iran is no different. As for one voice, even America can't seem to speak in unison these days...