Hey, Linda! If you already have a WikiTree account, you weren't signed into it when you posted here, so we can't tell if your DNA test information looks correct.
What I can say is that, his being born in 1609, your autosomal DNA test won't have any relevance to Captain John Seaman. Just too long ago. WikiTree arbitrarily sets eight degrees of separation (eight birth events) as the point to which the "DNA Connections" hints are propagated. It's a pretty good arbitrary line in that it extends out to 3rd cousins; but it also populates up the tree to 6g-grandparents and stops there...thing is, since we have to rely on tests taken by people living now or recently, 4g-grandparents are about as far back as most people are able to reach with their autosomal DNA information (at that point, 5th cousins, the average theoretical sharing amount is only 3cM; at 6th cousins it drops below 1cM and so effectively becomes zero as far as our ability to validate a match).
So very roughly speaking, if a test taker today is 55 years old and the average generation is 27 years, about the farthest back you can expect for autosomal DNA to provide evidence to a relationship is approximately 1774 to 1801...give or take a little. Beyond that, the DNA will simply have recombined too many times to be able to offer any meaningful genealogical evidence. DNA testing of the Y-chromosome and mitochondrial DNA are the two types that, because they don't go through recombination at each birth event, can reach back many generations before that.
