#21 "could" be Alan Storke as I found this NY Times article:
http://query.nytimes.com/mem/archive...659C946196D6CF
This shows that Storke died in 1910 and was with St Louis the previous year (the player in the #21 slot (2nd in from left in front row) is wearing a St Louis sweater) and the article says that Storke was signed by the Reds after 1909.
Jim Doyle was a Rookie with the Reds in 1910 so not sure why he would be wearing a St Louis sweater? Thoughts?
Thanks! Mike
PS I just found a great in depth SABR article on Storke that implies he was with Harvard getting his law degree in early 1910 and working out in Harvard's batting cages so not sure he was ever with the Reds team for a photo.
https://sabr.org/bioproj/person/59a8c452