If he gets extremely hot during that stretch I would suggest that, in and of itself, is quite a bit of upside. Sure, ideally you keep him down there to put off the future cost, but if he does come up earlier, it's not like its going to be a damaging financial setback to the team. Also, stemming the bleeding of fan interest this summer will have its own value. Odds are you can call him up for 2 weeks and send him back down and everything will be essentially the same. Maybe he gets incredibly hot and you can't sent him back, but so be it.