Well I think it also shows that's not so much that the team failed to address the rotation this offseason, but they've done a piss poor job of developing, acquiring, and locking up good pitching talent for some time now.
If the market stinks one year, you should have a couple of guys you can rely on and add depth or middling talent. The Red Sox rotation needed a complete rebuild and the only ACE potential talent either had significant age risk (Verlander), significant injury risk (DeGrome) or unknown risk (Senga).
This is why developing pitching is becoming more important. Teams are locking up their guys more and more. The Sox need to serious address this problem. They already have, unfortunately it takes years to develop guys.