Partially because of the focus on CMC, partially because New England's defense appears to have never met each other before.
The Patriots' defense is comically bad in the advanced stats through four weeks - they're by far the worst team. Nearly twice as bad as the second worst defense.
Removing preseason projections from the analysis, New England is the 11th worst team in the NFL through four weeks. One spot worse than Dallas, and only five spots ahead of the Giants. Granted, there's a pretty big drop off between 24th (Chargers) and 25th (Jets)