When the franchise used the seventh pick of the 2003 draft on Marshall’s broad-shouldered passer, the plan was to usher in a new era under center. Byron Leftwich didn't wait long to take the reins, inheriting the huddle four weeks into his rookie year when Mark Brunell went down and instantly giving fans a taste of his cannon arm and cool composure in a 2,819-yard introduction.

His sophomore season was defined by raw grit. Armed with a long, wind-up release and an ironclad pain threshold, Leftwich repeatedly stood tall against rushing defenders to feed Jimmy Smith down the seam. He directed four fourth-quarter comebacks in 2004, pushing the team to an 8–6 mark in his starts while compiling 2,941 passing yards and 15 touchdowns.

That trajectory hit its highest gear in 2005. Guiding an efficient attack to an 8–3 start, he protected the ball with precision—throwing 15 touchdowns against just five interceptions for an 89.3 passer rating. Yet, right as the offense hit its stride, a broken ankle in late November brought his regular season to an abrupt halt, setting off a string of health setbacks that altered his role in North Florida.

After ankle surgery limited his output to six games in 2006, a summer position battle in 2007 ended with David Garrard earning the nod, prompting the front office to cut ties with the former first-rounder before the regular season kicked off. Leftwich spent the second half of his playing career providing high-end backup insurance across stints in Atlanta, Tampa Bay, and Pittsburgh—picking up a Super Bowl XLIII ring with the Steelers—before making a seamless leap into coaching, where he called plays for Tampa Bay's Super Bowl LV championship run.

His run in Jacksonville yielded a 24–20 record, 9,042 passing yards, 51 touchdown passes, and eight rushing touchdowns.

Purdue player Uche Nwaneri was selected by the Jaguars in the 5^th Round in 2007.  Nwaneri entered professional football as a raw interior prospect with raw functional strength. He secured a roster spot as a rookie, earning rotational reps before making his first career start late in his debut campaign to solidify a physical offensive line during a playoff-bound season.

Nwaneri unlocked his starting baseline in 2008 at left guard before switching to right guard in 2009—a move that permanently established his place in the starting five. Renowned for his squatty leverage and persistent effort in the run game, he served as a primary road-grader alongside center Brad Meester, paving massive interior rushing lanes during Maurice Jones-Drew's peak power-running years.

He became a constant fixture upfront for North Florida over the next four years. From 2010 through 2013, Nwaneri missed only a single contest out of 64 possible regular-season games, routinely taking full-game snap counts despite frequent lineup changes around him.

After his release in March 2014, Nwaneri signed a summer contract with the Dallas Cowboys but chose to hang up his cleats when he did not make the final 53-man cut, ending his active playing career in a Jacksonville uniform.  He overall started 92 of his 104 games.

Entering the league in 2006 as an unheralded, undrafted free agent out of Maine, Montell Owens carved out a decade-long career by transforming third-phase kick coverage into pure artistry. With a relentless motor and an innate sense of the ball carrier, he quickly became the premier gunner on kick and punt coverage units, earning a roster spot through sheer hustle.

Owens' open-field tackling efficiency gained cult-hero status among the fan base, sparking a dedicated faction of supporters who affectionately rebranded him as "Mowens"—complete with custom jerseys bearing an added letter "M" on the back. He validated that admiration during the 2009 campaign by racking up 30 special teams tackles, setting an organization single-season standard. By the time his run in North Florida concluded, he sat comfortably at the top of the leaderboard with 118 total tackles on special teams units.

National recognition followed his coverage dominance. Owens earned consecutive Pro Bowl invitations as the AFC's designated special teams ace in 2010 and 2011, along with an AP Second-Team All-Pro selection in 2011.

Beyond his kicking-game accolades, Owens served as a versatile Swiss Army knife across the roster. Whenever injuries depleted the offense, he filled in as an energetic fullback, third-down tailback, and wildcat quarterback, starting four games late in 2012 and leading the squad with 209 rushing yards down the stretch. He even logged emergency reps on defense at safety when depth tested low.

After seven years with the franchise, Owens concluded his playing career with single-year stops in Detroit and Chicago before transitioning into NFL scouting. 

Arriving as the fourth overall pick in 2017 with runaway-freight-train credentials out of LSU, Leonard Fournette brought immediate, punishing physicality to Jacksonville's backfield. Weighing 230 pounds and bringing track-star top-end acceleration, he served as the battering ram that powered the team's run-first identity during an unforgettable rookie campaign, crossing the goal line nine times on the ground and racking up 1,040 rushing yards to earn All-Rookie honors.

Fournette's value peaked during Jacksonville's 2017 playoff run, where his violent running style proved tailor-made for January football. He ground out four postseason touchdowns across three games, including a three-touchdown performance in Pittsburgh during the Divisional Round that propelled the organization to the AFC Championship Game.

While injuries disrupted his 2018 campaign, Fournette rebounded in 2019 to showcase a far more versatile repertoire. He carried the offensive load with a career-high 1,152 rushing yards and evolved into a genuine receiving outlet, snatching 76 passes out of the backfield to tally 1,674 yards from scrimmage—the fifth-highest single-season total in team history.

Organizational shifts led to his surprise waiver release just before the 2020 kickoff. He landed in Tampa Bay, where his bruising postseason surges earned him the "Playoff Lenny" moniker and a Super Bowl LV ring alongside Tom Brady.  In Duval, Fournette had 666 carries for 2,631 rushing yards, 17 rushing touchdowns, 134 receptions for 1,009 receiving yards, two receiving touchdowns, and 3,640 total scrimmage yards.