Surprised so many of you picked defense. Donald and JJ are great players, but defense is not what is holding the Seahawks back, they are championship ready.
Seahawks need to get back to controlling the clock through the run game and scoring points, both of which a legit LT would instantly improve.
Holding an opponent to 10 points is great, but you still need to score more than 10 to win those games and last year I think there were 3 games (off the top of my head) where they didn't score 10. I know injuries played a role in this, but even going back to early 2015 this offense takes too long to get going.
I do like the Justin Tucker idea, dude is a stud. If Tucker makes a couple of those missed FG/XP the 2016 season could have been totally different. Even if he only turns the missed FG in AZ into 3, the Hawks get a bye, an extra week to heal up and who knows after that.