Dam, that's impressive to see that listPrevious Generation
Shogun
Rampage
Machida
Evans
Belfort
Sonnen
Jones' Generation
Gus
Glover
DC
OSP
Next Generation
Smith
Santos
Reyes
The previous generation looks the best on paper. And Jones pretty much scorched those guys(particularly Shogun).
That said, the best version of Jon Jones to set foot in the octagon was probably around the time of DC 1 IMO.
Previous Generation
Shogun
Rampage
Machida
Evans
Belfort
Sonnen
Jones' Generation
Gus
Glover
DC
OSP
Next Generation
Smith
Santos
Reyes