Dear Hart,
You can add appropriate stickers to this man to indicate his participation in the Revolutionary War. I don't think his profile would be managed by a Project Group unless he played a very large or very controversial role.
I looked at the NSDAR ancestor database and did not find David Horner recognized there. There is a sticker and template to link DAR Patriot Ancestors. If you know his Ancestor Number with them, you could add that sticker and link.
I'm sorry I don't know more. Hope this helps! -NGP