Welcome to the third edition of Red Sox power rankings, a wide-ranging excuse to write about the best and worst performers of the previous month as a new one begins. (This is about the 15-12 Red Sox of June. Now it's July. It's complicated, but you'll get it!) The only rule of the power rankings is that there are no rules to the power rankings. Media members, prospects, front-office personnel, Ed Jurak, even your favorite sausage vendor are almost as liable to be ranked as the current players themselves. It's a measure of the exceptional and the unacceptable, with the middle ground unacknowledged. The top five are ranked; the bottom five are not since our pool of candidates is innumerable. Let's get to it.