Maybe Felix Hernandez could have reinvented himself as a reliever a few years ago when the wheels started coming off, but I have to assume it's too late now for that to be more than a stopgap way of earning a few more checks.
Certainly, in 2006 when Felix was 20, there were games down the stretch where you have to think he could have been shut down earlier https://www.baseball-reference.com/boxes/TEX/TEX200608130.shtml … &https://www.baseball-reference.com/boxes/TBA/TBA200609030.shtml …