This paragraph is almost like the writer is channeling his inner Kimmi:
Of course, that ignores the trickle-down effect of adding Martinez. Maybe he provides lineup protection. Maybe he makes the other hitters better merely by his presence. Those are speculative ideas, however. One of the earliest and longest-running sabermetrics issues is the question of lineup protection, but comprehensive study after comprehensive study has failed to prove that such a thing exists. The Red Sox are better at the plate because Martinez is better than the players they had last year at his positions and because Betts is better than Betts.