I don't think it's right to label the Martin selection "by accident." Jerry wanted Manziel, but the personnel people won out. I'm not a fan of Jerry the GM, but I don't consider this much different than the Cowboys trying to get Baylor linebacker James Francis in 1990 before "settling" on Emmitt Smith, and that was under Jimmy's watch. The trade cards didn't pan out for Francis, a scout famously stood on the table for Smith and the team traded up and got him instead.
So take Emmitt away from Jimmy if we're going to take Martin away from Jerry because it happened "by accident."