I just today received a copy of Joshua's will, but thank you so much! It is interesting to think that perhaps the Jane mentioned could be Sarah Jane. Sarah Jane was born abt. 1838. Is mythinking right that Sarah Jane might be the daughter of one of Hetty Marcus' brothers? Sarah Jane didn't marry Wm. James Atkinson until Dec. 20, 1856, so if she is "Jane" in the will, she would have still been Marcus at the time the will was written.
Was Joshua Marcus the only one of the sons of Ellis Marcus who came to AL? I think the 1850 census for Autauga Co and some of the surrounding ones like Bibb might show a better list of Marcus families.