Sean Manaea's injured, that should make the decision a little easier for the Sox. He was one of their more likely candidates but his stock had been falling prior to the shoulder tightness.
https://twitter.com/keithlaw/status/336855502363430912
Frazier, Moran and Shipley seem like the three players most likely to be drafted by the Red Sox. That is, of course, assuming that a higher regarded prospect doesn't fall to 7th.