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What if An Lushan's 755-763 rebellion had succeeded in overthrowing the Tang and estabilishing a new dynasty (Yan) in China?

I hear that An Lushan had many turks, sogdians, and even arabs among his ranks. After the rebellion's failure, turkic/central asian influence in chinese culture and religion dwindled due to direct efforts of the Tang to curtail such. Could a success for Lushan's forces butterfly this away?

What were An Lushan's policy ideals, especially regarding administration, religion, and influence over Central Asia?

I also hear that the Tang were heavily indebted to the uyghurs after the end of the rebellion, and had to pay these debts by giving up the Tarim basin. Had An Lushan succeeded, could China keep its control over Xinjiang?
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