Who did John Dunlap Brown Substitute for as an American Revolution Soldier?

https://www.familysearch.org/search/catalog/355276?availability=Family%20History%20Library

As you may remember, I discussed my ancestry with you yesterday. So, I’ve attempted to read his Pension Request Letter or Documentation. It’s hard to read. In it, it states that he Substituted for Daniel Brown. Well, who was he?

Reverend Daniel Brown or Reverend Daniel Brown, Sr.? The reason I question if this might have been the one he Substituted for because of his possible kinship to Joseph.

Daniel Brown, son of William and Lucy Brown, was born June, 1755 in Culpeper County, Virginia. He was ordained a Baptist preacher when he was only twenty-two years old. He married Mary (Polly) Pemberton, daughter of Richard Pemberton of Cumberland County, Virginia. The children of Reverend Daniel Brown and Lucy were all born in Christian County, Kentucky.

Not sure if I’ll ever know…