A year-and-a-half after GM Brian Sabean thought he had a deal to acquire Adrian Beltre from the Mariners, the Giants are again in a position to make Beltre their third baseman. . .In the summer of 2008, Sabean was biding time at third with Jose Castillo, a little Rich Aurilia and, eventually, some Pablo Sandoval. Down a bat (or three), he swung a trade with the Mariners, according to a baseball source, that was agreed on by Mariners baseball people but vetoed by president Chuck Armstrong.