Could it be that later generations got the units mixed up? The request was made 80 years after his death and the children were young when he died.
Very plausible !
Many "mix-ups" had been passed down over the years based on family tradition.
My G Great Grandfather served in the 2nd Mississippi. Our amateur family "genealogists" ( without any knowledge of Civil War units)
automatically assumed he was in the famous 2nd Mississippi at Gettysburg.
Wrong.
He was in the 2nd Mississppi
State Troops.
Basically a local militia unit for older men & younger boys.
But while these family members ment well, their error caused confusion for many years.
So he was residing in Smith County, Miss. in 1860?
Im not sure where that is.
Smith County is in the far southern part of Mississippi.
About 300 miles south of Tennessee.
If I had to weave a story, I'd say that he did join the 6th (which became the 46th). He served a short time before becoming sick and came home. He never really recovered from the illness and died. There were other Stephens men from the close family who served in the 8th. The one who survived came home with stories and left a vivid memory in the mind of Dauz Stephen's children/grandchildren. They wanted to honor him with a tombstone. They used the memory they had - which was strongly of the 8th - to fill out the form. No deception involved, just poor record keeping by a grieving family.
I couldn't think of a better scenario !
Such was quite common.
Guys on the main fronts would get wounded, sent home to recover and then join different units when they were well.
( That was much easier than trying to make it back to their original regiment, (wherever that regiment may have moved to) ...
Edited to add: A few guys in my family that joined other units after they had recovered from their wounds were recorded as AWOL
in their old regiments. The new regiments they joined only kept the bare basics of records. At that stage of the War, the Confederates had a lot more to worry about than detailed personnel records.
@Sheltowee, I hope all of the above helps.
Smith County & Simpson Counties Mississippi are side by side, the towns, Magee & Raleigh are also in close proximity, so there will be crossover in many areas ... including military units.