One way the NFL tries to promote parity is by managing schedules in a way that creates matchups between the best teams from one season to the next, but also as games in which the worst teams play against each other. In other words, if you finished last in your division, you are guaranteed to play games against fellow division cellar dwellers across the league. The same is true for division winners and so on and so forth. After struggling with injuries last season, Brock Bowers enters his third season in the league as one of the top tight ends. Getty Images But even with the NFL trying to give breaks to its weaker teams, there’s no guarantee it happens. Which is why the Raiders, who finished tied for the worst record overall in the NFL last year, are playing one of the 10 toughest schedules in the league this year. It’s all predicated on the win-loss percentages from the previous season.…