Sending Crawford down keeps him in a starting role at AAA, but if he does well in his next start, I'd consider moving Houck to the pen, instead and sending Kelly or Ort to AAA.
The tougher choice may be when Bello becomes ready. I doubt they keep him in AAA, and hopefully it is they they move Houck to the pen, leaving this 13 man staff until Paxton and or Joely are ready:
Rotation: Sale, Whitlock, Kluber, Bello, Pivetta
Pen: Jansen, Martin, Schreiber, Houck, Bleier, Winckowski, Brasier and one from Kelly, Ort or maybe Crawford.
Paxton and Joely would force all of Ort, Kelly and Crawford to the minors.