I love this theory, though I am a bit skeptical. I think it's more likely that Taox was found by the awoken and gave Mora information about Oryx. Based upon this information I think she made a plan, especially after guardians defeated Crota, to ensure that Oryx could be defeated after he came, for she knew he could come because the Traveler was here.
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Osiris and eirs could of. Hell. Eris asked the queen to kill oryx with her.