Al Nusra are a Salafi movement, much like the Islamic terrorists in areas like Uzbekistan and other parts of central Asia.The Russians have already eliminated Jolani so his motley crew are without a leader,this whole operation is being run from Turkiye they no longer sitting on the fence threatening war with Israel all the while supplying them with goods and letting the Oil go through Turkiye, Erdogan is the most treacherous Muslim leader in West Asia.
I saw an interesting interview with an IndianGeo Political figure and he contends that the fighters in Syria are mercenaries from Ukraine and Uzbecks,Urgies from China and Azers very interesting points he makes.
It's not unusual for these fighters to move to the next hotspot in global jihad.
In the Middle East, when one religion is fighting another, they love to call the other side "mercenaries" because it degrades their religious virtue. "They're not real jihadis, they're getting paid (we assume), we're the real jihadis, God is on our side".
I think Syria might just end up breaking into separate Sunni and Alawite areas. For all intents and purposes that's how it's been for over a decade now anyway. But no western body would want to recognise a Sunni Syrian state ruled by Islamists.
Erdogan is supporting the Syrian rebels, but so is half the Muslim world. The Assad Govt are from a minority sect who have been pretty brutally violent for their whole rule. They've never been popular and have always been brutal.
I think it could be bad for Israel if the Sunni Jihadis get a border with Israel. Of course, Israel will be hoping (and helping) the Sunnis and Shias to continue to fight amongst themselves more than they fight against Israel.
Pretty much the history of the Middle East, with the Russians acting as the Christian Crusaders this time.