I way be way off track, but perhaps worth mentioning?
According to one online tree, Georgia Hoar and Charles Oscar Decourcy had two children
Carl Herbert Decourcy, born 26 April, 1891, Machias, Maine
Lillian Gladys Decourcy, born 21 March 1890, Machias, Maine
Looking at that tree, his name is also recorded as Carl Thaxter
A Carl Herbert Decourcy passed away in 1958 in California; his father's surname was Decourcy.
1910 District 0156, Middle Fork, Lane Co., Oregon Census
Carl H Thaxter, boarder, single, age 19, born in Maine as were parents. He was a time keeper for a railroad camp.
Also living with the same group of people was a
John Decoursey?, boarder, age 57, widowed, born in New York, parents born in Ireland. Foreman, Rail Road
Coincidence? Information is incorrect for your men, but
Also
1900 District 0866, Medford Ward 01, Middlesex, Massachusetts
Thaxter, Cannot read first name - typed record shows Firal?, born Aug 1863, age 36, father of 4 children; born Maine as were parents. Occupation Porter
Georgia? (cannot read middle initial); wife (2nd); born Apr 1866, age 34, mother of 4 children; born Maine, father born Eng Canada, mother born Maine
Lillian G, daughter, born Mar 1890, born Maine, father born England, mother born Maine
Carl H., son, born Apr 1890, born Maine, father born England, mother born Maine
Margaret A, born June 1897, born Maine as were parents
Charlotte G?, born Oct 1898, born Maine as were parents
Cushing Street, #50?
Note: I've not proofread the above, hopefully it doesn't contain any errors.
I wonder if John DeCoursey? was just a coincidence? Could he have resurfaced (using another name) after his "time away"? Note: His name on one of the pay sites is typed as "Decowsay" but the image could be Decoursey.
Update: John Decoursey could just be a coincidence. 1880 Census: John Decoursey, born c1854, New York, parents born Ireland.