Jim is correct in what he say's. We are fortunate on the Dover DNA to have a large enough sampling within our sub group (there are at least seven different unrelated Dover families) that something new popped up in a discussion with the DNA people ... we have a "preliminary" ancestral DNA signature of the first known father of all of us ... his 37 markers. The signature reflects the mutant markers of individuals in the group sampling that can and will change a little bit when more results are available. I have concrete proof on my family in 1850 in Alabama and research clues and coincidences via census and other records before that. The oldest proven ancestor in the group was born 1760. We know where from his RS. Most of my clues follow the time and place from that proven ancestor so it becomes a matter of filling in the 90 years when the science part of it suggests we have a common ancestor by 1800. Somewhat corny but a very good analogy given to me by FTDNA on mutant changes (certain markers that do not match) ... the first ancestor (signature) was like a spring. The water from his spring flowed in rivulets ... different directions because of mutants (pebbles, rocks, etc). Interesting on the Wisconsin Powell census ... there was a Lewis Powell nearby in 1850 that was born 1763 in Georgia. It's confusing with all the Cader and Moses Powell's, but the possible father of the oldest Dover mentioned above born in 1760 is the same John Dover mentioned in very early Georgia deeds next to Moses and Cader Powell on Upton Creek.