Problem here.
ISIS claims to be the new caliphate. Therefore, by definition, it proclaims all other Muslim states to be illegitimate and declares eternal war against them. As well as, obviously, all non-Muslim states.
I don’t see any incentive for a Muslim strongman anywhere else to submit to ISIS.
Unless the Muslims of those states see IS as stronger and decide to go “arab spring” on their governments. I see the Muslim mind set as if you shout “Allah Akbar” the loudest, doesn’t mater who you kill while doing it, your the best.