No denying it, but that's also the kind of staff this FO built no?
Winder missed time last year with a shoulder issue. Last season looks like an outlier as far as Ober's health is concerned, and even then he was shut down at the end of the year. Paddock's medicals have been beaten to death. Gray has missed his share of time during his career as well.
If plan B was rotating in young arms, Balazovic has struggled, Canterino is hurt after missing most of last year due to injury, and SWR has dealt with his own injuries and effectiveness issues lately. Maybe Balazovic's year is a bit surprising, but Canterino and SWR being hurt or ineffective shouldn't be. I didn't include guys like Varland or Sands because I don't see them as long term solutions in the rotation, but Ober would've fit that description prior to last year, so I guess there's that.
Alcala going down was tough, but even so, there were questions about which version the Twins were getting. Losing a setup man doesn't typically throw a decent pen into total free fall. They've been far and away the most glaring issue, and that's 100% due to a lack of viable arms.