Well, with Smith out until maybe July, we can hold off deciding on the last slot. Also, we usually go with 12 pitchers not 13, so it will likely be 7 RP'ers.
For arguments sake, I'll say our starters are Porcello, Price, ERod, Wright and Pomeranz. Buch is the 6th starter and long man. That's 6 of the 12.
Closer: Kimbrel
RP2: Kelly (Smith by maybe June or July)
RP3: Ross
RP4: Barnes
RP5: Hembree (0 options)
RP6: Abad (0 options)
Others:
Owens
Johnson
Kopech (maybe by July/August)
Elias (0 options)
Scott
Workman
N Ramirez
Jerez
Martin