Pete Carroll has been the head coach of the Seahawks since 2010. In that time Seattle has been to two Super Bowls and won one. But each year since the second Super Bowl at the end of the 2014 season, Seattle has achieved less. This year, of course, Seattle missed the playoffs completely.
Does not making the playoffs mean Carroll has gone from a great coach to a bad one? Of course not. But there is no longer any room for bad decisions because Seattle is less talented and more injured. Gimmick plays like the one Luke Willson ran at the end of the first half in the Atlanta Falcons game may show Carroll has some weaknesses.