[RUKen]

I have found and attached to this post additional images from The Pittsburgh Press of the Pirates in spring training (March 1913) at Hot Springs, grouped by position, including an unedited copy of the infielders. I have also attached the group photo that we've been discussing, to make it easier to compare the images. See my previous post for my thoughts on the other proposed IDs.

I believe that the player in the bottom row, fourth from the left, is Stanley Gray. He is in the newspaper photo of the pitchers, in the back row, far right. Although his face is dark in that image, it appears to be a reasonable match to the player with Babe Adams' hands on his shoulders.

You had identified the player in the bottom row, second from the right, as Gray. I believe instead that the player is Ralph Capron, who was in the Pirates' camp for the first few weeks of March, before being sold to the Phillies. Capron is in the newspaper photo of the outfielders, back row, second from the left.

I do not yet have an ID for the man sitting third from the right in the bottom row, but from his apparent age he is probably a coach.