Blake is building some value in a few ways ; 1. he may , in fact , become tradable this coming offseason to a team that doesn't have the luxury of 3 catchers at the MLB level, one of whom can play other positions. 2. There is no guarantee that Vazquez nor Leon will be the best options at catcher next year . Vaz needs to come back into a pennant race in the dog days of late August/September and actually do something beneficial. It is a stretch but Blake could perform well enough at secondary catcher and hitt at the .250 or better level over several weeks, plus he can run. 3. Maybe he becomes the Red Sox utility player of 2019 along with Holt, and Nunez becomes the odd man out, regardless of contract status.
For the team's sake in the race and the playoffs, I hope Blake makes all the decisions very difficult in trying to move him up and out.