Qatar backs the Muslim Brotherhood and, it appears, would not object to a brokered deal to end the insurrection that allows the MB to get its nose in the political tent, then make its play for winning control of the new government through some combination of foreign pressure, domestic mobilization, and elections.

Saudi Arabia, it appears, has no love for the Muslim Brotherhood and is perfectly happy to crater the Assad regime through a bloody insurrection abetted by foreign jihadis, in order to deny Iran a regional ally, score another victory for fundamentalist Sunni rollback, and increase the pressure on the Shi’a-led government of Iraq by adding the factor of a hostile, pro-Saudi and overtly Sunni Syrian regime to the increasingly disgruntled and emboldened Sunnis of western Iraq (some of whom are reportedly participating in the Syrian war).
....
Qatar hosted the reboot of the Syrian coalition—which still included a dominating MB component–as the “Syrian National Coalition for Opposition and Revolutionary Forces“.

At the time, I wrote that the ghost at the banquet was Saudi Arabia ..