Some things probably happened.
Like the US/UK/NATO destruction of Iraq, Libya, and Syria.
Or maybe you're convinced Brown, Blair and Bush weren't peddling conspiracy theories?
The OP alleges a source close to Saudi-Lebanese multi-billionaire , Saad Hariri, claims ISIS was authorized to launch its recent activities in Iraq during a closed-door session of the Atlantic Council in Turkey during November 2013.
"A 'trusted source' close to the Saudi – Lebanese multi-billionaire and former Lebanese P.M. Saad Hariri told on condition of anonymity, that the final green light for the war on Iraq with ISIS or ISIL brigades was given behind closed doors, at the sidelines of the Atlantic Council’s Energy Summit in Istanbul, Turkey, on November 22 – 23, 2013.
'The Atlantic Council is one of the most influential U.S. think tanks with regard to U.S. and NATO foreign policy and geopolitics. Atlantic Council President Frederick Kempe stressed the importance of the Energy Summit and the situation in the Middle East before the summit in November, saying:
“'We view the current period as a turning point, just like 1918 and 1945. Turkey is in every way a central country, as a creator of regional stability. However much the USA and Turkey can work in unison, that is how effective they will be.'”
U.S. Embassy in Ankara Headquarter for ISIS War on Iraq - Hariri Insider | nsnbc international
While your criticism of unconfirmed gossip rings true, it is also true that ISIS reflects the ghoulish face of American empire back at its source as it butchers on towards Baghdad
"(ISIS) are the specters of the hundreds of thousands of people we murdered in our deluded quest to remake the Middle East.
"They are ghosts from the innumerable roadsides and villages where U.S. soldiers and Marines, jolted by explosions of improvised explosive devices, responded with indiscriminate fire."
The 4th Media » The Ghoulish Face of Empire