FWIW, some new drilling in Dawson county in September:
http://www.shaleexperts.com/plays/permian-basin/county/dawson-county-tx
Those Diamondback and XTO leases are only about a few miles south of Northern Star and Big Star respectively.
http://www.texas-drilling.com/martin-county/leases/burns-lucille/041353
http://www.antaresenergy.com/wp-content/uploads/2015/09/2015-GOC-Presentation-ASX.pdf
Looks like the south of Dawson county does have at least some recent activity.