20+ games is a large enough number for me, i don't know about anyone else. We're not playing a 500 game schedule.
The logic is just flawed. "But schoe and garland are effective and you want to make them a 5?"
Pure hypothetical, i'd make Loaiza our 5 and Buehrle our 4 if it was easily possible (again, hypothetical). This would allow your rotation to be absolute dynamite. You wouldn't be hurting your rotation because Buerhle was "only a 4" and Loaiza "only a 5" now. You want the best 5 man rotation possible. Buehrle, ELo, X, Garland, Schoe, is better than Buehrle, ELo, Garland, Schoe, "Sure fire loss guy"