Rookie linebacker Jonathan Bostic was critical of his performance after his first defensive snaps in the Bears’ 27-21 win over the New York Giants on Thursday night. After replacing injured starter D.J. Williams at the end of the third quarter, Bostic said he could point out a mistake on every play. Williams injured his chest trying to tackle Giants running back Brandon Jacobs. Williams wanted to get evaluated before commenting on his injury. Bostic saw the game as a measuring stick. “It’s just a chance to get back out there with those guys again, just being able to play,” Bostic said. “I’ve been doing my part on special teams, just been doing whatever they asked me. Tonight I got a chance to really go back out there, play again. So I got to clean up some of those things. It’s another learning experience for me.” Bostic also saw some first- quarter action and played in the nickel package after linebacker James Anderson left the game with a back injury. Among the reasons Bostic didn’t begin the season as the starter was his inconsistency in pass defense. “He got in, got his nose in it,” linebacker Lance Briggs said. “He found out that some of the stuff that we see in practice or the preseason is a little bit different on the field. But Bostic is going to be big next week.” So, we all know DJ Williams was out, but I didn't know that earlier in the game, James Anderson was out, and Bostic basically took over for Anderson in the nickle, and DJ on other plays. As bad as our defense is, I think DJ Williams is essential to us even having the little pass rush we have, so Bostic can stay on the bench, as far as I'm concerned. It's good that his return was only "questionable"