Nothing new has come up recently.Check out my posting #203 on the Holyfield GenForum.That tells everything that Jim Holifield and I have have been able to document.
As for William, b. 1745, the following is just opinion, but I'm inclinded to think that he's associated with the Holyfields who went to Surry Co.That's because the family of William of 1745 is associated with the Padgetts, and I understand they were also from Surry County.
If Surry Co. is an important link, then we can look to Valentine, b. 1756, married to Susannah and went to Surry Co. he was son of Valentine, b. 1726 - 1736, married to Eleanor, who was son of Valentine married to Elizabeth in Anne Arundel Co., MD.
So, William of 1745 could be another son of Valentine and Eleanor.But this is far from certain.There are several Holyfield families in Wake Co., and they may have moved back and forth.Or, William could have been a nephew instead of a son.Throw in my Daniel, b.~ 1754 who ended up in Burke Co. with William of 1745's family, and you might have another brother to that William and Valentine of 1756 -- or not.
We need people to share any documentation they have on Hollifields or Padgetts from the 1700s to help us untangle these ancestors.