Ron Winchell purchased 70 percent interest in Brethren this summer in part because he felt the half-brother to 2010 Kentucky Derby winner Super Saver had “stallion potential.” But that’s for another day. Winchell said his immediate goal with Brethren is to “get him back at a graded stakes level,” and on Saturday the horse will move closer to that objective when he starts in the $150,000 Delta Mile.