Good to hear from you. I agree with your hypothesis...especially due to a recent contact on this board from Jeanne Calderwood. She said the one standing in the back/center is Henry Mason....her great-grandfather. Do you know Jeanne? I responded to her just today but haven't heard back.
My cousin Patsy has the original photo and I'm sure she wouldn't mind getting copies or sending it to me to do so. Colleen had already asked so in the meantime I'm trying out a photo service connected to MyFamily.com.
Talk to you soon, via email if you don't mind. Sue