The Giants on Tuesday traded for Astrosinfielder Jeff Keppinger and promoted Brandon Belt from the minors.Though Aubrey Huff's sore back and Miguel Tejada's abdominal injurymight be the proximate reasons, make no mistake: There was anotherforce at play. These moves, and other trades that general manager Brian Sabeanhopes to make, were borne equally of an offense that the higher-upsdeem insufficient for a division race.