If Seahawks coach Pete Carroll thought the offensive line started to come together just in time to pull out a win Sunday against the 49ers that doesn’t mean it’s yet earned the right to stay together indefinitely. In the wake of a second straight largely sluggish offensive outing in a 12-9 win over the 49ers — and having scored just one touchdown in 21 full possessions this season — Carroll said Monday to expect some changes when Seattle plays next Sunday at Tennessee. “There will be some things that will be a little bit different this week,’’ Carroll said. Predictably, he declined to say exactly what. When asked if he meant changes in scheme or personnel he smiled and said “yes.’’ But later, when asked a question about the offensive line he said “the competition is on’’ at that spot. “We are looking to make sure we keep it at the right edge to get better,’’ he said. “We’ve got to keep improving.’’ Seattle has used just five players for every snap for the five regular offensive line positions — center Justin Britt, right guard Mark Glowinski, left guard Luke Joeckel, right tackle Germain Ifedi and left tackle Rees Odhiambo. When Carroll was asked which backup linemen would be closest to working their way to into playing time the first one he mentioned was Oday Aboushi, who spent much of the preseason in a dead heat for the right guard spot before the Seahawks decided to go with Glowinski, who was judged by Pro Football Focus to have the team’s worst pass blocking grade Sunday.