If there really is such a thing as ISIS in Afghanistan (i.e. if it is not just a deniable front for the Haqqanis or their masters) and it gets into a turf fight with the Haqqanis and the Taliban then we will have an interesting experimental demonstration on our hands: a chance to see what counts for more? Ideological purity or state sponsorship? (I vote for state sponsorship, but if regional states fall into serious disrepair, then I vote for ideological purity).