It's possible some of those R1's on defense are busts.
That said, it's been an issue going back to Pettine that the defense as a whole is less than the sum of its parts. As for Barry, I think he's a guy who knows the Fangio defense, but doesn't understand it, if that makes sense. He doesn't adjust enough to situations, sometimes he just runs stuff as if he's blind or going off a script.

"3rd down? Let's go nickel!"
Nevermind it's 3rd and goal at the one yard line and David Montgomery is going to run through a gaping hole into the end zone.

Tanking is a fun idea if you can get an All Pro franchise player, but if you think they are going to be picking in the Top 3 this year you are either delusional or incredibly down on this team. There are worse teams in the league, and they will finish with worse records than GB. I think GB ends up picking around #7 and that's not getting you one of the top 2 QBs. It probably gets you a top tier LT like Joe Alt, which isn't bad, but they have CHI (via CAR), NYG, ARI, NE, and probably CHI ahead of them for picks at least.

In real life, NFL teams don't tank. The coaches don't survive a tank, the GM might not, and you absolutely lose the locker room. The GM could trade/waive players that would make it harder to win, but that time has passed for GB, and everything says they are playing to win. If you embrace tanking, you send a very bad message to the rookies and young players you're trying to develop as well.