Dr. Couch, Revelation 5:10 says in the Westcott & Hort "Thou hast made THEM a kingdom and priests ..." whereas the KJV says "us." Which is right?
ANSWER: I do not know an evangelical strong Greek seminary in the country that does not hold to the Westcott & Hort text. And this includes the well-known A. T. Robertson whom you refer to. As one who has taught graduate Greek for over forty years, and who has had more graduate Greek courses (much of it taught by the great Dr. S. Lewis Johnson) than anyone you will ever have known, the passage should indeed read "made them ..." as the correct Greek reading.
The Bible Knowledge Commentary agrees with "them" as well as the scholar Ellicott in his commentary. The respected Alford in his masterful commentary also uses "them." I know of no scholar worth his salt who would agree with "us." The strongest blow comes from Robert Thomas who in his commentary writes: "The 'us' rests upon such weak MS evidence, however, that it is not worthy of serious consideration." All of the above evidence ends the discussion!
Thanks for asking.
—Dr. Mal Couch