I have addtional and somewhat different information from Wildbores In America, 1933.Samuel Wilber sr.'s first wife was Elizabeth Lechford (no children).Ann Bradford Smith is cited as his second wife as you speculated + Smith as last name, but the above source only lists three children, not five: 1. Samuel Jr. b. 1614 rather than 1618 - married to Hannah Porter - six children; 2. Joseph, and 3. Shadrach.Furthermore on page 5 Benjamin Franklin Wilbour, the author of an article, laments that "It is unfortunate that Samuel Wilbore did not have a larger family, for three children was a very small family...".
Samuel jr. and Hannah's children are listed as John, Elizabeth, Abigail, Joanna, Rebecca, and Mary.
I am in agreement on Samuel, seventh child of William Wilbore and Martha Holmes who married Mary Potter, b. 1664. I have same dates as you cite.