You've named three teams out of 32. All three have been blessed by outstanding qb play over recent years as well. The Seahawks OLine isn't great, but it's not so far off the rest of the standard of the league.
You're at it about the division and conference.
Not so much the coaching, but also this team is a legacy of continued success not continual failure multiple top draft picks and massive cap space.
You're massively underpaying their defence. They've got the best player in football, and a top tier corner, and sound coaching. Also the 2017 Jags were massively overrated by their scoring, and you forgot the 2013 Seahawks defence.