Before the kids get back to school, we’re grading the best in class at the trade deadline. Here are the top deals from the swap meet to end July, with an eye on impact potential for the final two months of the season.RHP Jack Flaherty, DodgersHe flopped as a deadline-deal acquisition last year with the Orioles, but the 28-year-old revitalized his career after signing a one-year deal with the Tigers, and the Dodgers will reap the benefits down the stretch and in the postseason. With several question marks regarding their rotation, the NL West leaders landed the best starting pitcher dealt at the deadline.It doesn’t mean the Dodgers will cruise to a World Series title, but this trade potentially sets them up with a formidable playoff rotation of Tyler Glasnow, Clayton Kershaw (or possi…