Yeah he will be up at some point. Honestly, AA has built some decent depth for this year. We're really only 1 SP away at this point (granted Stroman could very well end up being that guy).
Good news about Santos, we are going to need him to bounce back. You are right about Morrow, he could be huge for this team, I just don't expect anything from him.
Gibbons has been masterful this season with the roster management. He has utilized the entire roster in a way that has resulted in optimal performance.