Yes, this is what I found as well. My husband's line goes:
Unknown Austin, Thomas Austin, Thomas Austin, John (Jack) Austin, Isaac Farrow, William Riley, Pell Burrus, and Clarence Burrus is his grandfather.
I just got started in genealogy a year ago and it is hard to list someone as unknown. I want to know! :) If you find out any further info about the unknown Austin, please let me know.
BTW... looks like we might be cousins somewhere down the line! :)