I pointed out on one of the “regression” threads that there are two meanings of regression that are being used interchangeably:
1) regression towards the mean in a statistical sense. There are numerous reasons for this including defenses adjusting, more snaps given to the run game, different WR corps, the wild card of injuries etc
2) regression in skill - return to previous mechanics, footwork, decision making etc
The former may well occur
The latter is clearly what some folks here and some pundits have been predicting