If you make a deal for an elite arm this summer and Garcia, Javier, and Urquidy return to their former levels, Framber continues to pitch at a high level, then congrats, you have a great staff.
I am assuming that McCullers is going to continue to have injury struggles. Maybe Brown will take the next step, it's still early in his career.
tldr the potential return of the injured and struggling SPs shouldn't dissuade you from making a reasonable trade for another young elite SP