No, that is an incorrect conclusion. Although it would be difficult to envision the Red Sox hypothetically finishing last in 2019, if it were to happen, it would be DD's fault, probably for doing something unthinkably stupid like trading Betts, or Bogarts or something similarly dumb. As the roster stands now, this team will not finish last unless they go down in a JetBlue crash. Arguing based on unlikely hypotheticals is so weak that only the most desperate debater would resort to it.