If a low-level spirit incarnated in Ork form might become a poltergeist if disembodied by slaying, as Tolkien postulated, then there is no reason why Sauron, when disembodied, should not have been able to levitate and move the One Ring.
The Ringwraiths were also able to wear garments to give shape to their forms.
With those two example, and nothing else written by Tolkien, the story that Sauron's spirt carried the Ring back must stand, pending new publication of later thoughts on the matter from Tolkien.
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