[Zhang Fei]

I see parallels with Khomeinist revolution in Iran in 1978-79. Different groups joined Khomeini’s supporters to overthrow the Shah. But once that objective was met & Khomeini got control, he executed many who had supported him but weren’t directly part of his Islamic circle.

The Baathists who worked for Saddam are conspirators par excellence. I doubt they're in any danger of being surprised by ISIS.

[odds]

The Baathists are akin to the MeK in Iran, in my view. Very similar ideology as well. I, too, doubt the Baathist will be surprised, but I do think there will be a strong likelihood of serious bloodbath should either group decide not to share power, which they won't.

Currently, there are also other 'Sunni Islamic groups' operating in tandem with ISIS; that's in addition to several Iraqi-sunni tribes. According to Peshmerga, some Arab-sunni tribes are being paid to side with ISIS or at least not interfere. Which group will ultimately have the upperhand will depend on a number of factors & is anyone's guess at present.