Looking at their roster, he probably doesn't break through until next season. I don't think he plays over any of Peralta, Marte or Jones. So in that regard, it's not a good destination for him until next season.
I think you need to get more honestly. Mondesi for a buck is big time value. Sure he was playing way above his head to start the year, but he's still a huge SB threat in a league where no one runs anymore.