I won't go too deep into the top guys - much has been written about it ... however
Ceddane Rafaela - there is a "not crazy" scenario where he is the Sox' starting CF by the All Star break. It's unlikely - and as a 21 year old in AA, it would not be any sort of embarassment if it was not so. But the dreams of him feel more real than dream for others.
Bryan Mata - a little more time away from TJS. Of the pitchers, he also has an exciting albeit not all that likely ceiling. Mata is a good stand-in for a number of arms in the org with wide ranges of outcomes. Do any of them create some serious optimism?
Nick Yorke - ultimately his entire profile is based on his hitting. Can he get back on the positive train again?
Blaze Jordan - can he stay healthy, and can his batting practice show start to make it into actual games?
Miguel Bleis - listen to the discussion I posted a few days ago. He struck out A LOT. But he wasn't chasing pitches - and the contact he made was elite quality. Can he draw some more walks and command the strike zone better? It is important to temper some of the box score expectations, he is still a 19 year old in full season ball. In the before time, Bleis would have had a few reps at Lowell last season, but alas.