Surviving Sumerian Culture and Society?

What if, instead of the Semitic cupbearer Sargon taking power in Mesopotamia and forming the Akkadian Empire, a Sumerian cupbearer or general is just as competent, and forms a true Sumerian Empire? Will the unity of ruling and working classes (the Akkadian ruling class was not Sumerian) enable this empire to defeat or assimilate the Gutians?
 
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