Meaning no disrespect to you in anyway; I can only relate the info which I have from other sources on the possible and spoken of Boone and Brightwell connection.
As I have it there was a marriage which would connect Daniel Boone's family to your Brightwells.I have no way yet of knowing if all the info I have come across about this marriage is true and accurate. Please understand I have not yet had the time to search for documentation on the info yet.
As I have it,your husband's g-g-g grandfather, Waller Lewis Brightwell and Permilia Mitchell had a daughter Mary F. E. Brightwell born April 02, 1842 married Thomas C. King born March 01, 1824.
They supposedly named a son, born May 23, 1868, Daniel Boone King. Thomas C. King's parents were James King b. 3/1763 NC and Rachel Stewart. Rachel was the daughter of John Horn Stewart born 1744 and Hannah Boone born 8/22/1746. Hannah was the sister of Daniel boone, the pioneer.
Now, like I said, I have not documented all this but simply because you have found nothing which indicates your Brightwell family was associated with Daniel Boone's doesn't necessarily prove there was not a connection.
I personally could care less either way. I simply am trying to find and log as much about my son's fiancee's family. Her mother 's side is the surname Brightwell who descend from the Spotsylvania Co. Virginia, best I can understand in the short amount of time of exchanging info, they are drom the Absalom Brightwell branch.
My son's fiancee's uncle "a Brightwell" is researching their family. He felt it interesting when he found his niece was marrying a Boone. I was married to the surname Boone prior to my present marriage.
I have very accurate and researched info on my own family lines and I do not profess to have or know of all the marriages or connections from my family. Thus I feel anyone that gives the attitude that simply because they personally have found nothing which indicates ceratin possibles in their family need to stop a moment and step off their pedestal!!!