Depends on the year.It's a natural question. One thing to look at is Bailey's tenure with the Giants 2020-2023. How did those staffs fare injury-wise?
2022 they were pretty healthy. Webb and Rodon both started 30 plus. Cobb started 28. Wood started 26. In 2023, not so much. Webb remained dependably excellent (33 starts) and Cobb hit 28 again. Rodon was in NY and got hurt again (as he does basically every year) but that isn't something that can be attributed to Bailey because, again, it happens almost every year.
Relative to this year - Pivetta is the one I question. He's been pretty damn dependable his entire career. Same for Giolito. Whitlock, I mean, he also gets hurt every year. Bello I seem to recall missing the first couple of weeks last year (forearm, I think) so maybe he's just a guy that takes a while to really get going. That'll bear watching to see if he comes right back and then posts every 5 days (like last year) or not.
I'm certainly no expert, but I found this interesting reading about pitch type and stress on the arm. It looks as though the two pitches that Pivetta favors (4 seam and sweeper) are quite strenuous for a pitcher but that change was made pre Bailey and Breslow, so it would be tough to blame anything on that change.
https://rocklandpeakperformance.com/how-different-are-torque-levels-across-various-pitch-types/
My take away - of course Whitlock got hurt, that happens all the time. Pivetta and Giolito are straight up bad luck. Kind of like the difference between O'Neill getting hurt in various ways (of course he will) vs Casas (are you effing kidding me). Bello is the TBD of the bunch.