It should be relocated at Zeno (Doctor Who and the Day of the Daleks) because the named character in the novelisation corresponds to this individual.
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After overhearing the Controller talking to the Third Doctor and Jo Grant about preventing the Dalek invasion of Earth and the Controller betraying the Daleks, he informed his masters of the Controller's treachery.
After the Daleks exterminated the Controller as a traitor, the senior guard was made his replacement. However, the Doctor subsequently averted the timeline in the 20th century. (TV: Day of the Daleks)