What I said was, if you have a game of fewer possessions then those things I mentioned will have a greater influence. I never said those things limited the number of possessions.
However:
a. Turnovers halt a team's possession unexpectedly, getting your team the ball sooner, and they also can have a great effect on field position.
b. Field position can also be aided by the offense, if you're able to avoid 3 & outs, and at least mount drives that get close to midfield, giving your punter a chance to pin a team deep.
(Luckily, the Pats led the league, by a wide margin, in scoring drives over 80-yards)
BB & Brady are unlike many teams except for maybe the Colts, in that they don't get too conservative when backed up, as I think not only are they confident, but they realize how important it is not to go 3 & out when pinned inside your 20.
Basically, considering what the Chargers are facing, imho, the best they can hope for is an 8 or 9 possession game in which they generate 2-3 turnovers, get stellar special teams play, and get at least 10-14 points as a result of those things.