To me, it makes sense to rank Meidroth ahead of Cespedes because Meidroth seems to have some MLB tools that could get him in games this week if the Sox wanted him there. He could fill in at 2B/3B/fake SS and show a decent batter's eye. Would he still have an 800+ OPS? Probably not. However, I'd bet that he could do better than Reyes' 716 from last year. If he's Brock Holtish in terms of production, that's a great outcome.
Cespedes is a player without a position right now. It's undetermined if he can stay in the IF. If he moves to the OF, there's even more adjustment for the glove. His bat is good, but his body isn't going to fill out anymore than it already has. Is he on the Jasson Dominguez track where he can maximize his body type or is he just a bulky short guy?
Right now, Cespedes is just so far away that almost anything could happen in his development. Meidroth is already on the doorstep.