The offense too has been showing signs of this too this season. Beating good pitchers like Oswalt, Halladay, Myers. Scoring a lot of runs too. The Giants have scored at least 4 runs 24 times this season, 5 or more runs 20 times. And the Giants were 66-15 when they scored at least 4 runs last season, 54-8 when they score 5 or more runs. Their pitching and fielding don't need that many runs to win at a great rate, even at 3 runs they were 10-10 last season.
The main problem with Hacker is that he's not on our 40 man roster and we have no space on it anymore after Denny Bautista was called up (I believe he took Lewis' spot). One alternative, I believe, which I think would be most likely, is moving Burriss to the 60-day DL, which would allow us to add a player to the 40 man. DeRosa getting wrist surgery would also put him him on the 60-day DL. Of course, depending on how they feel about Wellemeyer, they could possibly DFA him if they decided that this was all they wanted from him. Alex Hinshaw is another possibility, he hasn't done well in AAA this season, and I read somewhere that he was on the bubble regarding the 40-man in previous discussions about who to drop. I view this as unlikely since they could move Burriss, but you never know when they have decided they had enough, like when they let go of Billy Sadler.
Pucetas is already on the 40 man so promoting him would not require a move. But since the scuttlebutt is regarding Hacker, they must have thought through what they might have to do to get him on the roster before considering him so seriously.