So I guess that means a significant drop in the beheading of each other’s members while the fighting against Assad continues. After that, then all bets are off.
Islamists unite to form largest Syrian rebel alliance

Islamist groups fighting to topple Syrian President Bashar al-Assad’s regime and replace it with an Islamic state joined forces on Friday to form Syria’s largest rebel alliance, the new Islamic Front announced in a statement.
Islamist groups fighting to topple President Bashar al-Assad’s regime and replace it with an Islamic state joined forces on Friday to form Syria’s largest rebel alliance, the new group announced in a statement.
“The Islamic Front is an independent military and social force that is aimed at bringing down Assad’s regime in Syria and at replacing it with a just Islamic state,” said a statement released by the group.
A rebel spokesman, Abu Firas, earlier declared “the complete merger of the major military factions fighting in Syria”.
The merger of at least six separate Islamist groups comes after repeated calls for unity from opposition fighters and their foreign backers, and international frustration over a lack of solidarity among rebel groups.