You're right to be worried, I think, Ken -- although not THAT worried.
J McD has been running a super-conservative offense (run up the middle on first down) and sometimes that gets stopped, like it did yesterday. We've seen enough this season to know that he has plenty of wilder plays up his sleeve and I'm going to guess that they'll come out if needed. At the moment, though, it's all been about bringing Mac Jones along without breaking his confidence. McD has done a great job of that. The glitches -- not picking up delayed blitzes, the occasional bad throw -- are pretty minor compared with Jones's achievements. The first KB touchdown was great, not just for itself but for what it showed us those two players can do together.
But I do think that the run defense is seriously worrying. If your defense gives up a big play to a wonder catch by OBJ or DeAndre Hopkins or gets outrun by Brandin Cooks, fair enough. But not all teams have players like that. But every team has running plays for first down or third and short and, if you can't stop those, others will see it. Even during the Falcons and Browns games I was haunted by the memory of the Chargers converting a 4th down and pushing their running back into the endzone. Your DL has to stop that kind of nonsense.
In the past, the Patriots have done that with at least one big guy in the middle, going back to Ted Washington and Vince Wilfork. They don't need to be exceptional players like those two. Keith Traylor, Alan Branch and Danny Shelton did the job. I thought that was supposed to be Godchaux. If he can't get it done, it's a serious problem. Barmore is obviously a huge handful for the OL but he's not an out and out run stuffer (I think) and Guy and Davis aren't able to do the job, it seems.
What's worse is that BB pushed all his chips onto the table this season. Not only did he sign more players than anyone had a right to expect, but he signed them to deals that will accelerate next season. So there won't be the space for any kind of big signing to the DL in the off-season, given other needs (cornerback, tackle, safety).
I was really surprised that BB was spending like that for a team that, at the time, didn't have a quarterback. Now they've got one who is doing far better than any of us had a right to expect so this "re-building year" has suddenly become a competitive year. I'm thankful for that. Even if they go down in flames against the Bills and the Colts (I hope they don't, of course) it will have been a good year.