Byron Murphy Jr. is generally referred to as the Cardinals' No. 3 cornerback because he plays the slot in subpackages.
Vance Joseph sees the third-year cover man as much more than that.
When asked about his cornerback group during minicamp, the Cardinals' defensive coordinator listed Murphy at the top.
"You can see his growth," Joseph said. "He's so much more comfortable. He's grown into his body. He's working. He knows the system. He can be a special player for us. He can be one of our better players on defense."
Murphy played nickel a year ago, but was on the bench in base defense because Joseph used Patrick Peterson and Dre Kirkpatrick on the outside.
GM Steve Keim said earlier this offseason that the team prefers to keep Murphy in the slot, calling him "one of the better inside corners in the NFL."
But if Joseph wants him on the field full-time, that would mean some action on the outside when two cornerbacks are on the field.
That could depend on the health and level of play from the others – and the team's comfort level sliding their nickel corner around -- but Murphy is happy to play both if called upon.
"Wherever I am," Murphy said, "that's where I'm at. I think I can play inside and outside."
Murphy is at a funny place in his career. The former second-round pick still resembles the youthful player that arrived in 2019, but the NFL moves fast, and he's now the cornerback with the most experience in Joseph's defense.
"He's been the mainstay for three years," Joseph said.
"It feels a little different for me, because I'm still young," Murphy said. "I haven't played that many years in the league yet. But to have new guys come in knowing I was in that position before, and me knowing the defense to help them out, it makes me feel better."
While Murphy will try to help bring the others along, the most important thing is his continued improvement.
His rookie season was challenging, as Murphy played mostly outside corner after Alford was lost for the season due to injury. He finished with a Pro Football Focus grade of 48.3, including a 48.5 in coverage.
Last year, his improvement was noticeable as he settled into the slot. Murphy had an overall PFF grade of 64.7, including a 63.3 mark in coverage and a 74.7 grade against the run.
In a list of each team's most underappreciated player, NFL.com's Cynthia Frelund chose Murphy for the Cardinals, noting his improved ball-tracking rate, body control and deep ball coverage.
"And he's still just 23 years old," Frelund wrote.
The cornerback group will be under a microscope in training camp because Peterson left and wasn't replaced in the first wave of free agency.
The Cardinals will need Butler, Alford and Dennard to step up, but Murphy's continued ascent is just as crucial.
"Development was my whole thing (this offseason)," Murphy said. "Just to prove to my teammates and prove to myself that I can keep growing as a man, on the field and off the field."
Images of the Cardinals players during Media Day.