I figured it was worth an effort to do some research on the other T202, Milan McBride Schaefer On First, which some suggest depicts a sliding Jackson. I figured it was even more of a long shot that I would come up with anything definitive as the image merely shows a Cleveland player being held at first--hardly something that makes the paper, right? I read through all the articles of the 11 games Washington played in Cleveland. Only 1 provided any information which loosely supports the possibility that Jackson is the player sliding on that T202. Below is a HUGE scan of that article from the Cleveland Plain Dealer from the game of May 21, 1911. Of the 11 games these two teams played in Cleveland this is the only one which has an image from the game. Is it possible that headlines from the Cleveland Plain Dealer influenced 2 center panel images? Will let you all draw your own conclusions. And if so, is it Jackson or Graney sliding?
http://botn.com/images/May 21 1911 Naps.jpg