John and Abigail are in my direct line (I descend from daughter Abigail b. Aug 12, 1735 who marries Eliab Farnham) and I have had many of the same questions you raised. Do you show a death date for John? I also show Abigail as the third wife, m. Feb 13, 1729/30 in Preston Ct. I show her death year as 1753 (no date). I have some additional info to share, but my material is at home and I am at work right now.