A pox on both their houses.
I’m not sure he did. Khashoggi was connected with al Talal. He was outwardly supportive of the MB.
Turkey and Saudi Arabia have a long history of battle for power in the Middle East. At one point the leader of Saudi Arabia (Abdullah bin Saud) was captured (1818), brought to Istanbul and beheaded (outside the Hagia Sophia).
The Long Struggle for Supremacy in the Muslim World
https://www.wsj.com/articles/the-long-struggle-for-supremacy-in-the-muslim-world-1540572987 (pay walled)
FR Comments: https://www.freerepublic.com/focus/f-news/3700498/posts