I believe the mystery man could be Isaac Thomure b: 12 Mar 1875 based on the article, the cemetery information and this excerpt:
THOMURE, Isaac - born 12 Mar 1875 & baptized 7 Jun
to Isaac THOMURE & Elizabeth MYATT
Sponsors: Thaddeus Thomure & Mary Sucher.
Source: Perry County Historical Society, Immaculate Conception Catholic Church (Published March 1999), Midwest Genealogy Library, Independence, MO, 138
There are still inconsistencies in that Isaac Pierre Thomure had at least 8 other sons and news article states only one brother to the deceased.