Bob Fitzsimmons. Highly questionable that he was a heavyweight, but did win the lineal undisputed heavyweight title (only other British boxer that can say that is Lennox). Clearly the best fighter on the list pound for pound. In my view, top 5 middleweight and top 5 light-heavy. Not anywhere near top-anything at heavyweight. Lennox is the real answer, but he was not on the list. If I were inclined to do the write-in thing, then Lennox clearly.