What happened: PFF's Week 1 yards-per-play leaderboard put Buffalo first at 8.0 per snap. Chicago followed at 7.2, while Baltimore and Carolina tied at 6.7 and the New York Giants checked in at 6.3.

Why it matters: Buffalo's 8.0 mark fits the early picture of one of the league's most efficient Week 1 offenses. Chicago and Carolina both landing near the top gives added weight to their Week 1 opener as both clubs try to turn one strong sample into a trend.

What to watch: Week 2 will show whether those efficiency numbers hold once the sample grows. The next checkpoint is whether Buffalo stays clear of the pack and whether Chicago, Baltimore, Carolina and New York remain above six yards per play.