So, now after doing some actual reading of the Find A Grave memorials involved. I find that the one that was placed on the profile is not even the correct memorial for the profile.
Here is why: The wife of the William Lucas in question is named Mary Bushfield. She was born in 1783, in Washington, PA and died in 1891, in Marshall, West Virginia.
The "sourcer" found a William Lucas on Find A Grave, who happened to have married a Mary Bushfield, HOWEVER, that Mary Bushfield was born circa 1800, and died September 29, 1858, in Washington county, Pennsylvania.
Unless the person that was participating in the Source-A-Thon found evidence that the only family member in the WikiTree family group sheet has the wrong birthdate, date of death and place of death, and DOCUMENTS that, it just is not appropriate to slap the date of birth and date of death from the wrong Find A Grave memorial onto Lucas-872.
Now the dilemma is how to clear the error report. Should the "source" be removed?