I’m not seeing any evidence of the Iraqi Army in this whole thing. This is Sunni vs Shiite
The Iraqi army is predominantly Shi’ite, since the Sunni officers were removed after the BushII victory. So it is Sunni vs shi’ite Iraqi army (plus Iran help).
Lets see how the Shiite/Iranians volunteers do agaisnt the mad on victory IS forces. My money is they will fight hard for a day or so then run like scared camels back to Baghdad. Iraq id done as a nation. Biden’s 3 part solution may become de-facto truth in time.