ALLEN PARK, Mich. (AP) – The Detroit Lions have had one of the NFL’s best offenses this season, ranking among the league leaders in scoring and yards.  The Lions revamped their offensive line in the offseason and their three new starters have given Matthew Stafford time to throw and Reggie Bush room to run.  Entering the season, the unit was regarded as a weakness. Through four games, it has been an asset.  Guard Rob Sims says the offensive line has proven a lot of people wrong so far, but adds that he and his four linemates still have a long way to go.  Detroit plays Sunday on the road against the Green Bay Packers.