The Ravens are another team that could lose its QB. While the Chargers always seem to disappoint I think they make the playoffs as a WC. As for Jets and Pats, how many AFCE teams do you think can make it? Wouldn’t that make it all 4? That’s not going to happen.
Also if another team loses its QB for the season, it’ll obviously have a domino effect. If Tua goes down then sure; maybe the Pats squeak in. 7 have to make it. Look at the NFC. There weren’t 7 worthy teams last season (and probably won’t be this season), but they’ll take 7.