Something that will be interesting to keep an eye on throughout the season is what the Washington Nationals do with their starting rotation. With DJ Herz and Trevor Williams set to return at some point in the second half, and as Miles Mikolas and Zack Littell continue to sit with inflated ERA numbers, there is a chance that unit could look completely different at year's end compared to Opening Day when also factoring in the arms performing well thus far in Triple-A . Someone who figured to be part of the equation before he suffered a flexor strain was right-hander Josiah Gray. That was a disappointing development for both the Nationals and Gray, as he had recently returned from an extended absence due to Tommy John surgery. However, the team just received some good news regarding the 28-year-old. Josiah Gray Has Resumed Throwing Washington Nationals pitcher Josiah Gray | Sam Navarro-Imagn Images Per Mark Zuckerman of Nats Journal , Gray has resumed throwing.…