DNA Puzzle - Crawford Line

When I spit in a test tube for my first DNA test, I had high hopes of proving a relationship to another Crawford line and ultimately breaking through our brick wall in early Kentucky. Those hopes were greatly diminished when I wasn't a match to a known descendant of the James and Martha (Knight) Crawford line.

However, I had matches to descendants of William N. Crawford of Washington and Isaac and Nancy (Miller) Crawford of Kentucky. Those matches have revived hopes of figuring out how my Crawford line fits into the greater Crawford genealogy.

Since I have those matches 'painted' on DNA painter, I decided to experiment to see how they overlapped with DNA from my 2nd cousins.

 The above picture shows the DNA Painter results when I turn off my other lines.

• Blue -- Crawford-Hammond descendants (my 2nd cousins)
• Yellow -- Sellers -- have no idea how related but Crawford family lived near Sellars
• Dark Green -- Ralston-McCormick -- Grandparents of Josie Hammond (Crawford-Hammond line)
• Tan - William N Crawford of Washington
• Orange - Isaac Crawford of Garrard County, Kentucky

I expected to see overlap between my blue areas and the dark green Ralston-McCormick since everyone in the Crawford-Hammond group descends from James Barr Ralston and Nancy Jane McCormick. The Crawford-Hammond group represents my great-grandparents while the Ralston-McCormick represents my 3rd great-grandparents. Could this generational difference explain the lack of overlap between these two groups?

I was hoping to see overlap between my blue (Crawford-Hammond) and the other Crawford lines (tan or orange). Unfortunately, I can't see this overlap. However, there is an overlap between the tan and orange on Chromosome 1.

Does this overlap indicate that these two Crawford lines are related?

Is the lack of overlap with my Crawford line (blue) due to the fact that we have to go back at least 8 generations to find a common ancestor? OR does it indicate we are not related?

I posted a question about this issue in the DNA Painter User Group on Facebook and got some excellent advice.

First, since the Crawford, William N  and the Crawford, Isaac Garrard KY  both match me on Chromosome 1 between 74,314,526 and 82,818,466 we are likely all related.

Second, the fact that the Crawford-Hammond group does not match in this area of Chromosome 1 likely does not indicate a lack of relationship. This can be explained by the distance we have to go back to find a common ancestor.

Based on the advice from the Facebook group, I started looking at how 'Crawford, William N' and 'Crawford, Isaac' compare to each other on Family Tree DNA's chromosome browser. While playing around with Crawford matches and the Chromosome Browser, I found two more Crawford matches on Chromosome 1.

Now, to try and figure out how we are all related!