You came across a theory that I had given another researcher to work on that ended up posted on the internet as fact. Your facts concerning Kendall Marvel are only partially true. His wife was not Nancy Morris. Kendall Marvel's wife is still unknown. He did have at least 2 children. William C. Marvel and Eleanor W. Marvel who married Benjamin Warrington. This is proven by a deed wherein Benjamin and Eleanor Warrington give up their right to the land (1.5 acres) Eleanor inherited from her father.[Sussex Deed 56:334, 12 Oct 1849] William C. Marvel then sold the land to Samuel Hood.
Sorry for the confusion. Email me and I will put you touch with a descendant of William C. Marvel. I am not a direct descendant.