While the overall farm system of the San Diego Padres isn't ranked highly around baseball, there are still a few potential gems lurking for the team. San Diego has done a good job in recent years of scouting and drafting well, giving the front office a chance to use players in trades to add to the big league roster. The team has made a lot of blockbuster trades, gutting the prospect depth, but there is still optimism around the club. San Diego needs some of this youth to help the big league roster, and some guys have been making waves. The last major trade for the Padres was for closer Mason Miller, giving the team a star closer for the future. But there are others within the farm system that could be interesting to follow, including some that could be future closers for San Diego. A few writers at MLB.com ranked each team's most promising prospect who could become a future closer in the league, and the Padres' pitcher is very intriguing.…