I don't mean to be a killjoy in this really fascinating thread, especially with a post from a newbie, but could the sliding player be Bill Bradley?
I believe his last year with Cleveland was 1910, and Lord was with the Chisox during the last half of 1910. Couldn't the photo be from 1910 instead of 1911?
Plus, he has prominent ears and a thin face similar to the sliding player (and a similar appearance to Jackson.) But, I have no explanation for the ankle wrap
If it's Joe Jackson, that would be really awesome and a great find. As others have stated, we'll never know for sure until the original photo is found.
Again, this is a great thread!
Note: Photos from a thread on baseball-fever.com