I am fairly certain that Clarence Williams is the player standing on the far right. He was 37 years old in 1905 and was described as very overweight back in the 1890's. His father weighed 300 pounds. None of the other players in the photo could be him. The photo in Sol White's book was of a young guy in his late teens or early 20's.
I think the player kneeling on the bottom left is Frank Grant. And John Nelson is the player kneeling second from the right. Sorry I can't be a bigger help to you.
"He's tougher than a railroad sandwich."
"You'se Got The Eye Of An Eagle."