Pitching depth is always something that gets discussed, and we lost 2 of our top 6 SP'ers (Gio & Whitlock) and maybe our 7th/8th SP'er in Murphy for the full season.
One can argue Houck (the 5/6 going into the season) and Criswell (perhaps the 7th/8th SP'er with Murphy) have done a fine job as depth. Our main problem has been with our pre-season #2 Bello and the inconsistency of our #4 Pivetta. Of course, having more depth would help mitigate those deficiencies, but the depth would have had to be really good to oust Bello from the rotation, and it's hard to imagine many cheap depth signings doing much better than Criswell has done.
Of course, keeping Sale would have done wonders for the Sox, this year. We'd have maybe started Houck in the pen, but maybe it would have been Whitlock, which might have prevented his injury. (Ideally, we'd have started Pivetta in the pen, but that was not going to happen, IMO.
1. Sale
2. Houck
3. Crawford
4. Bello
5. Pivetta/Criswell
...looks like the best in hindsight.