The Giants sold low when they tradederratic and talented left-hander Jonathan Sanchez to Kansas City onMonday. They bought high on outfielder Melky Cabrera, who is comingoff a breakout season with the Royals. That's not usually a sound trading strategy. But Giants manager Bruce Bochy didn'tneed to consult his broker to understand why it made all the sensein the world. "(Cabrera) crosses home plate," said Bochy, "and that's a needhere."