That's fine, but are you of the opinion that there weren't pitchers 75 years ago that could throw as hard as some of the guys do now? There are lanky high schoolers that can throw 90mph with no real training. Do you think that there were grown men whose professions it was to get batters out that couldn't throw that hard 75 years ago? What about 50 years ago? Sandy Koufax was pitching 50 years ago and he certainly looks to be throwing mid 90's or so.
What about 65 years ago? Bob Feller: http://www.youtube.com/watch?v=KAm5fwb1Psw How about 75 years ago? Dizzy Dean:
Those guys all easily look like they could be throwing mid 90's. If someone looks to be doing it 75 years ago, then why not 85 or 90 years ago?