The Giants have their extra arm, and it's the guy who looks like the manager.
The Giants had a 40-man roster spot to play with after Tim Lincecum's hip surgery, and they had a lot of different things they could have done with it. They could have used it to add an emergency catcher, considering it's September and they only have Buster Posey and Jackson Williams. They could have brought up Steven Okert to give the Giants a third lefty out of the bullpen. They could have used it to take a look at a pitcher like Clayton Blackburn, who might be a part of next year's team.