Re: now, this is a difficult one
This is a possibility - at least he is the right age:
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1860 Pittsburgh, Allegheny Co., Pennsylvania census:
John "Stinson", age 33, b. Ireland, occupation drayman
Jane "Stinson", age 36, relationship not shown
I am thinking a drayman was a person who hauled things by wagon.
I did not find this person n 1870.There is always the possibility he got caught up in the draft for the Civil War - could even have been killed in it.