Last summer the A's dealt their generational closer, Mason Miller, to the San Diego Padres in exchange for a package centered around top prospect Leo De Vries. Shockingly, the A's have posted a bullpen ERA of 3.36 since the loss of Miller , ranking them second in baseball since the trade. The A's pitching staff has surprisingly been outperforming the offense so far this season. Although losing an unbelievable arm like Miller seems like a loss for the A's, they might have landed a star in the process. Not to mention the A's bullpen has been just fine without Miller. To start this season, Mark Leiter Jr. was expected to get the most looks in the closer role. However, a rough start for Leiter Jr. had the A's cycling through the with Elvis Alvarado, Hogan Harris, and eventually Joel Kuhnel. This off-season, the club was reportedly very high on Kuhnel, who eventually signed a minor league pact and joined Triple-A Las Vegas. A couple of weeks into the season, the team called him up.…