IMO: All part of POTUS retaliation for MOS/CIA/Graham trying to destroy the Trump/MBS Anti-Corruption Coalition (Khashoggi, no arm sales to Saudi, Congress votes no support to fight Yemen, etc)
Israel wanted US and Kurds to occupy Northern Syria so they could abscond the oil, but … POTUS punished them hard!
US troops pull out and POTUS welcomes Turkey (Muslim), Saudi (Muslim), UAE (Muslim), Egypt (Muslim) to fill the void, and now giving Iran (Muslim) a nod to stay in Syria == Israel's Worst Nightmare for Syria End State! OMG, how will they ever be able to get to the oil now?
btw…which Ally did Mattis keep referring to in his tizzy on the way out? I think we know.