I think Duffey is doing fine so far. May really needs to work on his command. I am not so sure about Harper, Littell and Stewart, especially Stewart, I don't think he can survive in the major league.
Duffey and Stashak should stay as of now. Harper might stay. He should not be trusted to be a fireman. He should just start a clean inning. Stewart does not belong in the major league. He should be demoted immediately. Parker should be DFAd immediately.