I am related to Joel Cook thru his daughter Susan Ethelzelda Cook. My research has also been clouded by the common last name and so many repeats of the first names. I am constantly confused by the interchange of Daniel Cook and Lydia Churchill and Daniel Cook and a wife with last name of Fuller.
One of those couples were LDS and traveled to Utah where they died. There has also been speculation as to one Cook couple being parents to the other Daniel Cook.