That's the concern for me too. I would guess the status of Greene and Lodolo will tell them which way they should go with it. Abbot being the only guy they can count on will not get them in the playoffs this year. It may very well be Joey's final year as a Red as well, would be nice to send him off a winner.
Even if Greene and Lodolo are able to come back, adding a 4th guy to the rotation needs to happen.