Yes it looks from this as if Sarah KNIBB who married Robert WYNNE went on to marry John HIGHT.
I wouldn't be at all surprised if Frances IRBY is related. It might explain why she was selling negroes formerly(?) owned by Sarah and still in her possession.I have two IRBY/KNIBB marriages but not her nor can I place John IRBY.Doubtless IRBY not KIRBY.
Do you have a date for the sale by Robert to Thomas KNIBB?Do you think he was Thomas KNIBB or Thomas Knibb WYNNE?