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Don`t be so sure that Osgood is dead. Jump back to The Day of the Doctor, and you will note that Osgood frequently used an inhaler, and the lack of inhaler indicated her Zygon duplicate. Following the ratification of a treaty between humans and Zygons, why wouldn`t Osgood-Zygon be allowed to maintain a liaison post with U.N.I.T.?
No inhaler. Not Osgood.
Expect the character to return.