Re: Fitzsimmons vs. Sullivan
Mendoza, although I disagree, you make a good argument.
If you carefully review Sullivan's record of very fast and brutal knockouts (a LOT of them), I think you will revise your opinion about his punching power. Read John L. Sullivan: The Career of the First Gloved Heavyweight Champion, and you will see how much in awe of him the public was. When there were no legal regulations and constraints (or LPR rules which allowed for long-term survival), Sully bashed the living hell out of his opponents, including Mitchell.
As for the phrase, 'the bigger they are the harder they fall,' it is a common historical misbelief that Fitz coined that phrase. John L. Sullivan actually said it before Fitzsimmons, and there is primary source evidence of it.