If anyone has seen the 1979 version of Dracula (specifically the scene where Dracula arrives for the dinner party at the beginning of the film), you can hear cues Williams later used as the Imperial March a year later in The Empire Strikes Back.
In this you are absolutely wrong, Sir. "The Imperial March" does not sound like anything in "Dracula".
Regarding reusing the Skyfall cue: does anyone complain when Zimmer reuses action themes from Batman Begins in The Dark Knight Rises?
People are forgetting that not only is this the same composer as Skyfall, this is a sequel to Skyfall (not to mention a third sequel to CR).
I must admit - I was disappointed at first, too, having Newman repeat that action cue here. But it probably is his way of using the Bond theme - and that´s what Barry also did. And maybe it is even motivated by the film itself.