The game has evolved quite a bit since the days of Eddie Taylor, and Brumback has been the one who has done the most to bring the theory forward.
With nodisrespect to Eddie Taylor or Bugs Rucker, the two names that seem to automatically arise when the discussion of greatest bank pool player takes place, I think Brumback merits serious consideration as the best bank pool player of all time, and is at least comparable with those other two legends.
I'm not suggesting that John is better than Eddie, Bugs, or Fargo at making bank shots, but I think his shot design is by far the best in the world today and, probably, the best ever.