With regard to Casey Kelly, while it's true that he has been getting roughed up lately, the Sox continue to be very high on the guy. I can't find the link, but there was an article on Boston.com within the last two weeks where his performance was evaluated. As I recall, he is now having to deal with men on base. Something that he has little or no experience with. Pitching from the stretch is new to him.
Also, he needs to work on developing his secondary pitches and command.
The article quoted several Sox player development/ coaching/ FO as saying that they are actually pleased that he is having to deal with adversity now, during his early development. They feal that he has the stuff to learn from the experience and become a mainstay in the organization for some time.
I don't think that he will be dealt anytime soon.
Also, another member of Talksox (I believe it may have been yh213) recommended the site overthemonster.com. They have daily updates on all Sox prospects, Low A through AAA.
It's really good stuff.
http://www.overthemonster.com/