Would rather continue to develop Lord than waste starts on a rental, especially one who won't get much at the deadline. But as long as he's healthy, Soroka will benefit from play-the-contract.
he can develop at AAA, if that's what you are looking for. he's only had 12 starts at AAA, 55 innings. I don't get a sense of progress and development if he keeps on giving up a couple of runners most innings and isn't going more than 70 pitches.
