If keep your untouchables and then Meyer, Pearson, SWR, Thomas (if Alek)
If you are getting Grayson, Patino, Noelvi for Strasburg id take that, then trade McCullers, Carlson, Patino, and McClanahan for a top player to keep
Thats my quick opinion
So let me play devils advocate here...if he lost developmental time and that's the issue, wouldn't it stand to reasons he will get to the same point as he would have, but take longer to get there than many expected