For much of baseball history teams used a straight four man rotation. Harang and Arroyo are more than capable of going deep consistently without tiring. Any chance we could switch to a four man rotation and use a spot starter when one of the four needed an extra day of rest? It would take away the problem of trotting out Mays or some other washed up has been/never will be every fifth night. With the dearth of starting pitching I'm surprised no one has tried it. Starters went more than six innings on "short rest" before and they are more than capable of doing it again.