Exactly.
When Lester came up, I remember some folks being upset the Sox dealt “the good lefty” Kason Gabbard (for Eric Gagne?) instead of the slower starter in Lester. Clearly they made the right choice.
The Sox do have a very young team right now, with Anthony, Mayer, Durbin, and Narvaez all starters in their second season. Certainly they assumed some would struggle but not necessarily all of them. Add to that other starters (Duran, Abreu, Rafaela) who don’t have much more experience. Basically only Contreras and Story as experienced starters, and both of them at ages where decline sets in.
There was clearly a lot that could go wrong, and I would be surprised if they didn’t expect some of it too. But they had issues with far too much going wrong.
And even then, they built a strong rotation and a good defense, which can be enough to carry a team a long way. They had their lifeboat.
They just forgot to put a bullpen in that lifeboat…