Recently added to Ancestry.Com's databases is " The Magazine of Va Geneology" which in 1987 transcribed an Acct Book from Hanover Co., VA which in 1756 has an entry where Christopher Butler, father of Zachariah Butler, pays an acct for his son.
This is the first factual link of Zachariah to anyone (that I have seen) and unless there is another Zachariah in the same place about the same age (which I can't find) I believe it is the father of our Zachariah. I know all the links to James but have never seen anyone show any evidence for that link. If someone has evidence--not quoting someone but SOMETHING please let us all know. Till then I will work on the assumption his father is Christopher.
Don't mean to sound arbitrary--holdover from teaching 34 yrs.