But, wait, there's more -- in his "Second Presidential Finding Memo" Obama authorized additional CIA covert action in Syria back in 2012
2012: WASHINGTON, Aug 1 (Reuters) – President Barack Obama has signed a secret order authorizing U.S. support for rebels seeking to depose Syrian President Bashar al-Assad and his government, U.S. sources familiar with the matter said.
Obama’s order, approved earlier this year and known as an intelligence “finding,” broadly permits the CIA and other U.S. agencies to provide support that could help the rebels oust Assad.
http://www.huffingtonpost.com/2012/08/01/obama-secret-syria-order_n_1730712.html?tw_p=twt
At that time, the real fighters were primarily Al-Qaeda. There were others, but these were the experienced fighters. Their goal? They were not after establishing a Syrian state but rather an Islamic State.
Obama's objective was regime change first. The CIA and McCain (+other Rs) were all on board. I say this period of time was the actual origin of ISIS more than anything else you can point to. If not the actual origin, then it it when the idea of it became a reality.
Put this in light of the Kerry audio and the picture becomes more clear.