What would their value have been

[Klrdds]

I certainly think it goes without saying that the longer a player lived the less his signature would be worth whether it would be Mathewson , Gehrig , Ruth, Josh Gibson maybe also even pioneers like Buck Ewing, and Ross Youngs .
Would it have affected Honus Wagner, Cy Young and Nap Lajoie ? I would say probably not or very little because of how old they were when they died.
Additionally one major factor affecting their value would have been if they had lived long enough to have been part of the baseball card show/convention circuit and the rising popularity of through the mail autograph requests.
It is not only how old you were when you died but also the era / years you died . These 2 factors affect the pricing of any autograph whether a HoFer, superstar or common ball player .