Sunni States vs Iran - was this the ISIS plan ?

[Reality Check]

There is a fault line dividing Syria, Iraq and the Arabian penisula.

Iran is battling on many fronts and defending their client states and client militias.

Saudia Arabia and Egypt are joining the fight on the Sunni side.

The nightmare scenario is that ISIS fighters are the only ones that fight well and ISIS ends up controlling all the Sunni states that join the war against Iran.