An estimated 60 percent to 70 percent of the Jaguars’ new defense has been introduced to the players this offseason.

“We’re just trying to get the base fundamentals down,” defensive line coach Todd Wash said. “We haven’t put a lot of the big-time pressures in yet.”

Just as the new coaching staff has tightened the screws on players by changing their role (starter to reserve), position (tackle to end) or address (by releasing them), the Jaguars hope to apply the same kind of big-time pressure on opposing offenses.

Last year, the Jaguars’ inability to stop the run — 30th out of 32 teams — was matched only by their ineffectiveness getting to the quarterback — last out of 32 teams.

The Perfect Storm was an underperforming defensive line, believing linebackers should retreat south in coverage instead of north in pursuit of the passer and an injury-plagued secondary that was immune to taking chances.

“It was the whole thing — all of it went hand-in-hand,” safety Dwight Lowery said.

For the Jaguars’ record to improve from a franchise-worst 2-14, the whole thing will need to be better. Corners and linebackers need to cover better. Safeties need to tackle better. And the up-front guys need to pass rush better.

Last year was the second time in four seasons the Jaguars finished last in sacks — and they were 31st in 2010. Their 20 sacks last year were five less than any other team.
Among the more dreary statistics:

They went without a sack from late in the Week 1 loss to Minnesota to the middle of the Week 5 loss to Chicago ... a span of 165 opposing quarterback drop-backs.
In two losses to Houston, they sacked Matt Schaub — not exactly Mr. Mobile — twice in a combined 94 drop-backs.

The secondary had one sack.

And the Jaguars didn’t have a player with more than 3.5 sacks.