Kathryn: The surname "SYLER" did ring a bell so I looked through some notes and found that a Jacob SYLER was on the bond of Elizabeth Fortson when she was appointed administrator of Stephen's estate in Roane County, TN. According to that article I previously linked to, Stephen's daughter Adaline supposedly married a George SYLAR but I haven't found documentation of the marriage.
The Fortson surname really got butchered. In the 1830 Roane County census record, its given as "Foson" yet court records generally have it correctly as "Fortson". Virginia records also support the spelling as "Fortson" although I think I have also seen it as "Forson". Information passed down through several generations of my family consitency have it as "Fortson". At home I use Heritage Quest (free, through my library) for census records but often I find it unreliable so I usually go to the actual films at the library. I could not find this Charles, using Heritage Quest, in 1860, 1870 or 1880. Have you found him?
The Missouri connection is interesting. Stephen's daughter Susan Elizabeth, married Bazil D. Freeman, and in 1860 the couple was living in Webster County, MO. Not exactly next door to Ray County, probably around 175-200 miles away, but again not a huge distance either. Another poster to this board, Virginia Taylor, traces through this line and might be willing to share info. I believe that a Stephen "Forsen" is also enumerated in the 1850 Ray Co., MO census but I'll have to double check. This might be important because Stephen "Sr." did have a son named Stephen. My family lore has it that Stephen "Jr.", on his way to Texas on a business trip, visited his sister Martha Brookin (nee Fortson) who was living in Little Rock, Arkansas. Supposedly, he brought Martha her share of the family estate. No time period is given so it's anyone's guess as to when this might have happened. Anyway, the story goes on that Stephen, Jr. promised to visit his sister on the return trip but was never heard from again so "it was suspected he was killed by Indians." Typical family lore. Although the visit might well have taken place, the rest of the story is suspect. I will look a little further into this, time permitting. You might be on the right track, I just can't say at this point.
BTW, I have seen a couple of references to a marriage between Charles and Emily Jane Green, one in 1843 (MO) and another as 31 December 1835 (Saline Co., MO) but I have no proof of either.
Lastly, there is something in the 1880 census I need to re-visit and will let you know if I find something but by any chance do you know if this couple divorced? Rick