We've used 8 SP'ers, not counting openers. If you go with the idea that Sale, Paxton, Whitlock, Houck and Kluber would have been the starting 5 on opening day, if healthy, then we've gotten 40 starts from the back-ups (18 Bello, 13 Crawford and 9 Pivetta.)
Technically, only Bello should be counted as help from the farm, and since Murphy and Walter have yet to start a game, one might think we've gotten little rotation help from the farm. Some might have counted Bello as one of the starting 5 to start the year, so he should not be counted as "help from the farm." (Plus, he graduated by like 2 IP, last year.)
I see our farm as producing some mighty important pitchers on the 2023 staff, recently. I'm not getting hung up on terminology or "rookie" cut off IP. We went so many long years until Houck was called up as any sort of significant pitching help from the farm.
Recently, we have seen this, so I am not complaining about pitching help from the farm, for a while:
Graduation Dates according to SPs:
Nothing for a long time then these two in 2021
6/21 Whitlock
9/21 Houck
Since AUG '22
Crawford
Winckowski
Bello
Ort & Kelly
Bernardino
Murphy
Jacques
I'm sure other teams have done better, but this is a big improvement.
According to SP, here are the ETAs of current pitching prospects on the farm:
\
2023 (has some MLB experience, already)
13. Walter
38. Robertson
59. Politi
2024:
11. Drohan
21. Mata (would have been ready in '23 had he not got hurt)
27. Fernandez
31. Guerrero
39. Troye
48. I Coffey
51. Liu
2025:
8. Wikelman
32. Dobbins
40. Paez
43. Gambrell
2026:
7. Perales
25. E R-C
29. Monegro
34. Bastardo
35. Rogers
I'll admit, the up and coming list is not eye-popping, but there are a lot of promising pitchers in the system, of which several should take steps forward the remainder of this year and in 2024. My guess is we will feel better about the list, this time in 2024.