The Cowboys have 99 drives, 288 points, 2.91 ppd. The list you're looking at is team points, not offensive points. It includes return scores, and doesn't account for number of possessions. Every added possession for the offense means another possession for the opponent.
Yes, points per drive is certainly a better way to gauge an offense. By the way, we have 285 points, not 288. Looks like you were calculating TD*7 + FG*3, which is reasonable.
PFR has us at only 97 drives. FO has us at the 99 you report. Not sure where the discrepancy comes from (I would expect FO to be pruning out kneel-down drives, but that would make things go the other way). Anyway, using PFR numbers, I went back and looked at how teams did in PPD in their first 10 games, on the assumption that for some of the top teams, it's likely to drop later in the year (resting starters in the last game or 2, colder weather, injuries). Seems like that was the case for some teams, not for others. Anyway, the current Cowboys still stack up great. There are basically 3 tiers at the top through 10 games:
Tier 3, between 2.91 and 2.97 ppd: 2016 Cowboys, 2016 Falcons, 2015 Patriots, 2014 Packers, 2012 Patriots. All from this decade. The Cowboys are actually at the top of this tier.
Tier 2, between 3.06 and 3.25 ppd: 2013 Broncos, 2011 Packers, 2005 Colts, 2004 Colts, 2000 Rams. Those teams all make sense.
Tier 1:
2007 Patriots. 3.95 ppd. Three point nine five points per drive. Yowza. They really fell off after their first 10 games (2.67 the rest of the way), presaging their scoring struggles in the AFCCG and SB.
So yeah, we are indeed in very good company.
