Hi - were you able to sort this out? I realize your post is old, but Malinda Ann (or Ann Malinda or Melinda...) has me scratching my head. I don't have a Silas as a child of her and John Eddy Jr, though. Granted, I am new at this, but nothing clearly points to this Malinda being the daughter of Kemp Gaines and Mary/Polly Deason. In fact, it would've been impossible - I've seen birth year of 1791 and 1797 for Malinda, but Kemp Gaines b. 1786 and Mary/Polly Deason b. 1789 would make them children when they had Malinda.
There is another Malinda A. Gaines with same vital information: b. 22 Dec 1797 VA d.26 Feb 1868, married to a William James Price b. abt 1820. Both are buried at Rocky Springs Cemetery, Bridgeport, Jackson, AL.
If you have other information, it would be a great help. (I am a descent of John Eddy/Ann Malinda Gaines' daughter Ann Orlina Eddy.)