Cowser had a really terrible MLB debut but nothing else to prove in AAA, then hit 304/418/717 last spring. It's plausible he doesn't earn a spot last year if he starts the spring 1-23 or whatever. I guess Cowser was a year older and actually has defensive value, but maybe Mayo could have forced the issue if he performed. You know they'd want potential ROY candidates on the roster.
Not gonna check the exact numbers but I think Westburg had a pretty strong spring in 2023 after already getting a pretty solid AAA sample and didn't make the OD roster that year so I'm a bit skeptical about that premise