Hiya, Don't look for Isaac to hard... The Isaac is James... I don't know whether it was a middle name or whether he just wasn't divorced yet,,,as I donlt think the Joyce death I found was for his wife,,,although it may have been...
The child born to Ann I think is Joseph and they may have changed his name at baptism after they married....I think it was James illegitamite son with her.
On one of the 1837?marriages the witnesses are Susan SHORT and James ALLINGHAM,,,I think this is Ann SHORT before they married.
They Jemima Coles you mention may have even been Jane Roles,,
One thing I can see is they all seemed to change names alot..Probably because they all kept naming children the same,,,so they would be called by middle names etc.