Part of the problem of gap control and tackling is that players are often out of position or coming from well away from the play to make a play. So they do swarm, but it leaves gaps as it happens. And, as you noted, not many are winning individual battlers (Daniels previously being a big exception), no one is clean to make a play. So everyone is one arming their gap.

So swarming to the ball while one arming the tacking leaves a lot of broken tackles and lots of space to operate. The Capers Packers D has always been aggressive to the ball to the point of hurting itself (minus the 2009 season in run D). They need to slow down, play the gap and put a body on the ball carrier. Once they master that, then you can try for strips, big hits or penetrating deep into the backfield.

Right now its not sound technique.