Is it time to recalibrate U.S. policy in the Middle East again?

(I use the term "policy" loosely.) For background on my question, see my previous post. If what happened in Aden really does represent a proxy war between Saudi Arabia and the UAE, where would that put U.S. policy on the Middle East? 

More to the point, where would it leave the Trump administration's relations with Riyadh MbS and Abu Dhabi MbZ? Trump and his son-in-law, Jared Kushner, have been very friendly with both princes, who are the de facto rulers of their respective countries. 

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