I have just discovered a fact that may clear up the mystery of why William Rogers Capps/Lucy Fly Capps were only listed on the Carroll County census records and Henry Capps/Anna Fly was shown on the Gibson County census records.
In 1836 the county lines were in a straight line. The South Fork of the Obion River flowed in a South East to North West direction crossing these county lines. This put part of Gibson County north of the river and a part of Weakley County south of this river. David Crockett lived in the China Grove area of what was then Weakley County in the South West corner. The Southern tip of what is now the 16th District of Weakley county was the land that was swapped with the China Grove area between the 2 counties in 1837. During this swap there is a 2 mile strip of land that was east of the Gibson County north/south line. This land was gained from Carroll county at the time of this swap by Weakley County.
By studying the maps of today and 1836 I have determined that the land where William and Lucy were buried would have been in this 2 mile strip. In fact this land would be joining this north/south line separating Gibson and Carroll counties.The land of Henry Capps and the graveyard where he is buried is located just across this line on the west side.
Now to a question for the forum. Is it possible that since this land was in Carroll County, for those years prior to 1837, could the census of 1840 still have been made for this small area by Carroll County instead of Weakley????