Top 3 right tackle? Can you name 3 better right tackles? Lane Johnson, maybe the Chiefs' Mitc Schwartz is up there, and .....Bueller? La'el Collins is probably top 5 at this point.
If one McCourty goes they both will, and they might just flat out retire given their age and the fact they're now on a likely to be rebuilding team.
They drafted some LBs mid rounds which historically has proven successful for them and they still have Bentley to play MLB but it's a young, raw core out there.
Their defense might be "bad", as in back to 2011-2013 Patriots "bad" defense, but not "bad" like some of the Dolphins teams or the 2013 Cowboys defense level bad. Last year the defense (not Brady) netted them a spiffy 12-4 record, Gilmore is the best corner in football, but the offense just kept getting worse as the season progressed.
I still say they will win some games they shouldn't due to coaching (Belichick and McDaniels are still there as well as utility guys like Edelman and White) and they are the league standard for special teams prowess (e.g., Slater isn't holding out) so I still give them a chance to win 6-8 games. Maybe even 9. We'll see.