From what I have seen I am sure this is the same individual.I was able to get on WorldConnect and was amazed at the work done on John J. Caldwell.
I have several newspaper articles from the "Valley County Gazette" from the early 1900's that are starting to make sense.I have one dated Saturday, August 17, 1907 that says, "Oscar Schuler has returned from the "Sarg" Caldwell ranch over in Dawson County where he briefly examplified the art of hay-making to his Missouri friend."
I've yet to find a Death Certificate for John J. Caldwell.
Thank you for the information you have located.I will check out the findagrave.com. for the info on Thomas J. and Martha.