That's why the Panthers are installing even more 3-4 wrinkles -- three linemen and four linebackers -- this season to go along with their regular base 4-3 scheme. Rivera likes the versatility it brings to a defense that finished 28th in the league in points allowed last season.
"It adds a little bit of doubt in people's minds," Rivera said. "You can start with a 4-3 base and move into things and create some situations for your opponents."
And, he hopes, create turnovers. Carolina managed just 24 takeaways last season.
The Panthers planned to use more 3-4 looks last year, but a lockout-shortened offseason and some devastating injuries forced them to be fairly vanilla on defense.
Defensive coordinator Sean McDermott said the Panthers have the personnel this year to effectively run the 3-4 "in certain situations."
Defensive end Charles Johnson, Carolina's highest-paid player, would see action as a pass-rushing outside linebacker in the 3-4 as he did a year ago.
"In the 3-4 you generally blitz a lot, so hopefully we can dial up a lot of blitzes and stuff out of that package," Johnson said.
The Panthers started off well in Sunday night's first training camp practice, coming up with four interceptions during 11-on-11 team drills against the offense.
Copyright 2012 by The Associated Press