The difference in 11 and 12 is taking a WR off the field and putting a TE on the field. Lot of folks over the years have criticized McVay for not running enough 12. But my take on all that is the talent at TE was not as good as the talent at wideout and that drove his decision making.
Applying it to this season the translation is do you choose Tutu or Ferguson/Allen/Parkinson. We could dip into Whit, Smith, etc too in that discussion.
What I'm thinking right now is if Ferguson can give us that good possession over the middle, stretch the seams a bit, threaten on wheels, etc., there's going to be more snaps where McVay opts to roll with 12.