I really really abhor the terms 'swagger'/'swag'. There's absolutely no correlation with having a bunch of trashtalkers and a winning football team; you could win or lose either way. The similarity I see between the top 4 teams (yes, this includes the broncos and patriots) is the unwavering confidence those teams have in what they are doing. Specifically, with regards to seattle and SF, they have confidence oozing at every position on the field. Part of that comes with just great players, part of it comes with having the confidence in their HC and gameplan to succeed.
These teams have a coaching braintrust that knows exactly what it takes to beat a specific team; they are always the ruthless aggressors. They're never caught on their heels, and they always go for the throat.
Now, part of that may manifest itself in trying to intimidate their opponents i.e. trashtalking and I'm totally fine with that. It's the defeatist attitude and the total lack of self confidence this cowboy team and its coaching staff has that I'm not okay with. There isn't even a pulse to win.