Sorry but your analysis here is completely off-point. There was no trigger but it had been calibrated to occur sequentially. The only coincidental act is the rocket attack on Riyahdh airport. Based on what I have been told, the push against Iran is really MBS with his messianic complex - Nasser rallied the Sunnis previously and Pan-Arabism fell flat because of the Six-Day War. Then it was Saddam as a reaction against the 1979 revolution. Kushner was in KSA the same week this happened. So that is not a coincidence. MBS is 32 years old and believes he should be the leader of the Sunni world and will rule for at least the next 50 years. This is a young chap who bought a yacht for $500million because he liked the sight of it.
It is clear that the only real trigger is the collapse of Iraq and the forces it unleashed, in particular the ability for the formerly majority oppressed Shia population of Iraq to take control and Iran filling in the void.
Bear in mind that 20% of KSA is also Shia and they are in the oil producing region of KSA. This "version of Islam" is not really the issue. Its really an issue of who leads - the Saudis via MBS or the Iranians via the presiding Ayatollah.
As for the nuclear agreement your assertion that the Iranians had pulled the wool over the eyes of the world is really stretching incredulity. It was an agreement hammered out by Iran with major European and US negotiators who have much better depth of understanding and breadth of knowledge of Iranian matters. The checks and balances of the deal have yet to be prove that the Iranians are in breach. Also not sure why it is "clear" that the Iranians have gone all out - the strategy has been specific - they declared that they would never allow Damascus to fall to ISIS, and they (together with the Russians) poured resources into ensuring it did not happen. Would you have preferred a Syria controlled by ISIS funded by the GCC nations?
So what source of evidence do the Saudis and Israelis have that they have not shared with the rest of the world? Do you think really Bibi would hesitate to go to the UN and offer direct incontrovertible proof that they are in clear breach? He who drew this at the UN in an attempt to demonstrate the clear and present danger Iran posed?: