Pablo was the 2012 world series MVP. That's pretty recent contribution to success. 2 HR off Verlander in game one. He's also started to hit this year, finally, going 13 for 32 in his last 8 games. He was probably pressing badly in his contract year. As for the Giants trading him, Sabean and Bochy each have a lot of patience, and even if they didn't, they haven't brought a 3Bman up from Fresno to press him. Pablo is their guy at third. As for Headley, he had one big year in 2012, he dropped off last year and is struggling big time this year. Also, would he hit in the AL anyway? Career .683 OPS vs. the AL, but pretty good numbers against Boston, NYY and Detroit, of all people.
Back to the Giants, they aren't going to be very impressed with the Sox young pitchers you mention. They're in good shape pitching-wise and with the nice lead they have in the West they can afford to wait until the deadline if Lincecum remains inconsistent. But, he's picked it up in his last two starts anyway. Their other bottom of the rotation guy, Vogelsong, has been overall excellent in his last 5 starts. I don't see anything with the Giants. Bad clubhouse karma if nothing else for them to make a move when they're playing so well year to date.
All good points. A cursory look at the top ten for the Giants reveals a plethora of high end pitching prospects. As for Pablo's success this year I think your chemistry point and the question of who plays 3b for them are both big impediments to a deal. I knew I was underselling his contribution but to be fair the Giants frequently cite weight,inconsistency, etc as reasons to not pay the man big/good money come this offseason.
I've always preferred adding a bat to the OF because there is more selection in the market and our LF platoon is not providing the needed pop from the 5th spot in the lineup.