Tarvaris Jackson has started 34 regular-season games in his NFL career so you’d think an exhibition might not mean all that much. But after losing his job in Seattle last summer and barely getting on the field in the preseason then getting traded by Buffalo without ever taking a snap in any sort of game he admitted that what he did Thursday night was sort of special — exhibition game or not. “It felt pretty good man’’ he said after throwing two touchdown passes to lead the Seahawks to a 31-10 win over the San Diego Chargers in their exhibition opener at Qualcomm Stadium. “That was my first game really since 2011 (in the season finale for the Seahawks against the Cardinals). So it’s been a long time. It was just fun to be out there.’’ Jackson went 8 of 9 for 128 yards and a quarterback rating of 158.3 to lead Seattle to 24 second-half points. And in the process he likely took a big step toward securing the backup quarterback job behind Russell Wilson. “He played perfectly’’ Carroll said of Jackson. “He was on it he threw some great balls.’’ Jackson’s competition for that spot Brady Quinn actually entered the game after Wilson and before Jackson and was 6 of 11 for 59 yards. Quinn threw a touchdown pass to Jermaine Kearse of 11 yards following a turnover that put the ball deep in Charger territory. Otherwise though it was mostly a night for the kids as the Seahawks saved the bulk of the playing time for rookies and other young players trying to make the roster. The Seattle starting offense played just two series and didn’t do much gaining a total of three first downs before punting on each drive. Russell Wilson was 2 of 6 for 23 yards and was high on two throws on third down as Seattle’s starters gained 42 yards on their 12 plays. Carroll said he thought the first-unit offense was a little sloppy.