They're really fucking doing it, aren't they?
They're gonna turn Iraq into a Wahhabi pawn in order to get at Iran, just like they did with Syria so they could clear the Syrian airspace to be able to launch strikes on Iran from planes without the need to refuel. We already saw what the US did with their bunker busters with Syria's airspace being accessible to them.
Those prisoners that have been transferred will escape. I would put money on it.
(Edit: Alt-text provided by comrade Edie. Tyfys o7)
They just dropped thousands of trained, blooded ISIS fighters into Iraq
they're ISIS-related detainees, the ISIS prisons in Syria had whole families, they're not all fighters or in an organized state. Iraqi militias are tens of thousands strong.
I may have misinterpretted your post as foretelling collapsing Iraq but you're still overstating the possible mischief in the current balance of forces. Given some months and CIA supply that might change but ISIS seems equally disposed to being a problem in Syria that HTS will have to crack down on after using the prisonbreaks to fuck with the SDF.