Jon,
George Stallings was manager of the 1914 Boston Braves. And while his name is not on your list, David Atkatz has a beautiful, bold blue ink signed player transfer that he listed for sale several days ago:
https://www.net54baseball.com/showthread.php?t=299866
I have no personal or financial interest in David's item, as I already purchased a Stallings signed 1921 contract a couple of years ago. But the signature on David's item is far superior to that on mine. I think you would be pleased.
Just wanted you to be informed. My thanks. And best of luck on your hunt.
Vincent