So far this season, has been more lows than highs for the Washington Nationals pitching staff. While Foster Griffin's incredible return to the majors has been a huge boon for the rotation , the average performance from Cade Cavalli and the struggles of Zack Littell, Miles Mikolas and the bullpen has put the Nationals 29th in the MLB with an ERA of 5.24. A positive for Washington is that they appear to have a solid stable of arms on their farm. Not only are eight of their top 15 prospects pitchers , but two of them are also ranked in the top 100 overall. In addition to that, two of their Triple-A arms have taken home International League Pitcher of the Week honors this year.…