The Rangers indeed will have six potential starters if they sign Japanese right-hander Yu Darvish. They could trade a starter. They could return right-hander Alexi Ogando to the bullpen. They also could try a six-man rotation.
Nolan Ryan, the team’s old-school club president, might object. One Rangers official said he “doubts” that the team would end up using six starters. But every rotation candidate except right-hander Colby Lewis might benefit from a reduced workload, particularly after two straight runs to the World Series.
ESPN's Andrew Marchand mentions that the Yankees bid less than US$20M for Darvish because:
...[they] could not be sold that his stuff and his makeup would translate in the majors. From Kei Igawa to Hideki Irabu, the Yankees have seen firsthand that Japanese pitchers often aren't successful in the majors. So they weren't prepared to go all-out for a pitcher who hasn't thrown even once in the majors.