In addition to the White Sox trading Peavy to the Red Sox, the Red Sox sending Iglesias to the Tigers and the Tigers dealing Garcia to the White Sox, Brayan Villarreal was sent from Detroit to Boston and Boston traded minor leaguers Cleuluis Rondon, Francellis Montas and Jeffrey Wendelken to the White Sox.
To get Peavy, the Red Sox gave up four players: Iglesias, Rondon, Montras and Wendelken. The Tigers picked up Iglesias in exchange for Garcia and Villarreal. The White Sox dealt Peavy for Garcia, Rondon, Montras and Wendelken. In my opinion, Iglesias is a better overall player and has proven more at the big league level than Garcia. Because of that, the Red Sox gave up more than the White Sox actually received for Peavy. Yes, Garcia has a chance to be an everyday OF for the White Sox, but Iglesias has already established himself as one of the top defensive SS in all of MLB. Iglesias for Garcia and Villarreal seems like a fair deal, with Detroit giving up the extra player in case Garcia does not pan out.
For the White Sox, it will be interesting to see what becomes of the players obtained from Boston. Rondon is a 19 year old SS who has struggled to hit at the low levels of the minor leagues, finishing off my hitting .202 in 29 games at A Kannapolis in the White Sox system. Montras is a 20 year old RHP who is a starting pitcher with a plus fastball and a high K percentage. Spending the whole season at A, he was 5-11, 5.43 with 127 Ks in 111 IP. Wendelken is a RHP who has always been a reliever. He moved up to A+ Winston Salem after the White Sox acquired him.
If Chicago gets a contribution from all four players they added, they could get the best of this trade. The Tigers gave up the least, but also got Iglesias, who has not proved that he is a good enough hitter to be an everyday player. I think the Tigers will neither consider Iglesias a steal nor see either of the players that went the other way become big time players. As for the Red Sox, they have Peavy for 2014 as well and, if they win the World Series, would have to consider the deal for Jake Peavy a success.