Here is the expected migration map for R-BY56749: http://scaledinnovation.com/gg/snpTracker.html?snp=R-BY56749
FamilySearch.org indicates that Isaac Atwood died in Massachusetts before John was born in Virginia. I think that is a misconnection.
If you join the WikiTree DNA Project (https://www.familytreedna.com/groups/wiki-tree/dna-results) I will be able to look at your kit and see if I see anything that explains the Simmons, Spradlin or Ray connections. My guess is it is an ancient connection, before there were records or even surnames.