I think you're right that Rhoda's husband was a son of Isaac Bell I. I've seen a listing of his many children that included an Isaac, so maybe she was married to this Isaac.

I found an Isaac Bell who married a Mary Sharp in 1727 in Gloucester County. The location is not where I expected to find Isaac, but that marriage date makes a lot more sense and allows for him to easily have had the 14 or so children he is supposed to have had. I'm trying to research this couple now.

Thanks for your help with this.