Robertson and Santos weren't really great prospects TBH. I don't think they lost much value there.
I think Crag trying to acquire guys that can potentially start is important since it's an area that Bloom ignored for 4 years. Fitts and Sandlin may never work out, but they desperately need to address the lack of legitimate starting rotation guys they have. If that means trading their 5th best reliever to do so, fine.