To me a realistic plan with post-2019 Sale would have been to view him as a wild card until he proved otherwise, not as the presumed anchor of the rotation.
I don't even like the word "plan" that much with some of this stuff. A large % of baseball players are very unpredictable from year to year. Teams need all sorts of backup plans, if they expect to be successful.
Look at Texas in 2023. Their Hall of Fame candidates, Scherzer and deGrom, were virtually useless, and it was Eovaldi and Montgomery who really delivered, especially in the postseason.