Kevin Harvick cruised to an eight-second victory over teammate Clint Bowyer.
Edwards has been a hot name for a top-tier ride in 2018. If, of course, he comes back to NASCAR.
Next week's race at Daytona is Junior's last scheduled Cup race at the iconic track.
Bowyer won at Sonoma in 2012 and has eight top-10 finishes in 11 career starts at the California road course.