I really don't disagree with most of what you have posted here. I have stated before that the team has to go with the best overall alignment, factoring in both offense and defense. I do prefer seeing Moreland in the line up over JBJ, I can't argue about that.
To date, JD has not been a great liability in the outfield. That said, if he continues at his current pace, he would end up costing the team roughly 2 games defensively over 150 games. JBJ will end up saving us roughly one game defensively. That's a 3 game swing, which is not insignificant. I do caution that we are still dealing with a very small sample size and that JD will not play 150 games in the OF.