Earlier in the week, we examined the chances of the San Francisco 49ers starting the season at Seattle in the NFL kickoff game on Thursday, Sept. 4.While that matchup makes sense, there could be a wrinkle -- the league may want the 49ers to open the season by showing off new Levi's Stadium in Santa Clara. The team is moving into the stadium adjacent to their team headquarters in 2014.Recent NFL history shows that most teams that open a new stadium play there in Week 1, but it's far from a slam dunk.