I do not think the linebackers are that good.I don't think they've gotten complacent so much as they're more talented than good. Middle breaks open and the RB continues his route instead of blocking the guy about to kill his QB. That's coaching. Linebackers don't seem to know how to fill a lane or are consistently coaxed out of them.
Just not the best execution I've seen today and it reflects much of what they did during the season.