Okay, I found my Census book. The 1850 Stewart Co, TN it shows a Silas Futral living with William and Martha Jones and family. This Silas is age 41, which would make his birth between 1809 and 1810. I show that David's Silas was born about 1810. Although it isn't definitive proof, I would speculate they are one and the same. Another clue is that David's father and mother(David and Martha Ricks Futrell) also had a son named Silas who was born about 1773 and died before 7 March 1796.