The problem is not in the valuation of the players. Every reasonable, unbiased, and objective forecaster had the Sox being a good and competitive team. I read this morning that, to date, Pedroia and Victorino are the only 2 starters who are performing at or above their PECOTA projections, and those projections tend to be conservative. Victorino's been on the DL, so that really only leaves Pedroia.
You can reasonably expect some players to underperform their projections, maybe 1 or 2 players by a lot, but you also would expect some players to overperform. We are not getting any overperformances.
Porcello now has the 2nd worst ERA of all qualified starters, ahead of only Shane Green. Miley, Kelly, and Masterson also all have career worst ERAs this season. That is just inexplicable.