'Sharp's Rule' was the result of diligent study of biblical Greek by Granville Sharp. He was famous for tirelessly opposing the appalling criminality of capturing native Africans and forcibly transporting them across the Atlantic. He developed this 'rule' in the late part of the 1700s. He noticed a Greek idiom that had previously been commented upon by Beza a hundred years before, but which had not gained widespread notice. So, when speaking of Sharp's Rule, it should be remembered that this was a continuation of the work of Beza.
Scholar Daniel B Wallace has itemised this history and added his own support. He listed eight New Testament texts as important examples of Sharp's rule, defining the rule as follows:
"...whenever two personal nons come together (with the exception of
proper names) which are connected by the particle kai and to the
former of which any case of the definite article is prefixed, then
both of these nouns are invariably to be understood of the same
person." The Orthodox Churchman's Review, February 1803, No. 2, Vol. 4, page 105
An example in English of applying the [Greek article] / substantive [a noun] / kai [usually rendered 'and'] / substantive [a noun] would be:
"Present at the meeting were the Estate Agent and the Owner and Occupier, Mr John Smith." [the / substantive / and / substantive]. In such a case, English also drops the need for the second article in front of the second noun.
Wallace had Titus 2:13 as one of his eight examples - "...awaiting the blessed hope and appearing of the glory of the great God and Saviour of us, Jesus Christ."
Note, first, that 'the hope and appearing' is a similar idiom, dropping the second article and 'bracketing' the two similar concepts, 'hope' and 'appearing' which both have the same context and the same aspect of meaning. By using only one article, the two items are grouped together. 'The hope and the appearing' would not express the fact that the two concepts are linked and function together.
Further, 'hope' and 'appearing' are not persons, so - strictly speaking - Sharp's rule is not applicable to that part of the sentence, but to the persons then detailed in that sentence. However, that does not constitute a problem in dealing with a particular interpretation of Revelation. The 'door can be shut' on a literal one thousand year millennial rule of Christ on Earth using other biblical facts.