The 2006 NCAA rule that allowed graduated athletes with remaining eligibility to transfer and be able to play immediately has fundamentally changed how college football head coaches construct their teams.

The rule change has given rise to a pseudo-collegiate free agency period, where a stacked program in need of a leader under center can lure immediate veteran help that can instantly make an impact.

There could potentially be as few as two incumbent quarterbacks returning to starting roles next season in the 14-team SEC, and maybe  even less depending on whose opts for the draft and who loses out to fresh blood in camp. In a league as historically strong as the SEC, it’s amazing how much turnover there is at the game’s most important position.

It seems like almost everyone could use some help at QB, but here is a look at five SEC teams who could use an upgrade at quarterback the most:

Florida Gators

The Gators went from having a loaded stable of signal-callers to a slew of depth questions at quarterback in just a matter of days, losing out on top recruit Jacob Eason to rival Georgia and suspended starter Will Grier, the architect of their 2015 SEC East title, announcing he was transferring.

Current starter Treon Harris has shown flashes of brilliance, but the offense has essentially sputtered down the stretch under the sophomore’s leadership. Don’t feel too bad for head coach Jim McElwain. The first-year Gator coach was able to lure Feleipe Franks away from LSU and added three-star recruit Kyle Trask to his 2016 recruiting class. Plus, McElwain has seven quarterbacks enrolled in his program. Florida is a talented team and might not have the luxury of waiting for Harris to develop into a top-level quarterback. An immediate upgrade, even it’s it from the in-house stable of quarterbacks, should be merited.

LSU Tigers

Does anyone want to play quarterback under Les Miles? LSU lost out on highly-touted, four-star recruit Keytaon Thompson to Mississippi State this week after losing Lowell Narcisse to Auburn this summer. Both are considered top-10 prospects in the 2017 class. But the Tigers need help sooner than that anyway, with Brandon Harris never truly grasping the offense this year and Feleipe Franks, thought to be the second best pro-style passer in the 2016 class, decommitting from LSU and picking Florida.

LSU would be an ideal fit for Miles’ program that’s ready to win now, but elite options are dwindling quickly as players such as Oklahoma transfer Trevor Knight appears to now be a potential front-runner at Texas A&M. Top RB Leonard Fournettte returns for the Tigers, so it would behoove them to complement the potential Heisman candidate with a quarterback to give the offense some depth.

Texas A&M Aggies

Despite one of the worst months, personnel-wise, in program history, Texas A&M might be one of the few teams on this list with a legitimate shot to cure its quarterback woes right away. The Aggies suffered a mass exodus under center in December as Kyle Allen and Kyler Murray, who combined for 2,896 yards and 22 touchdowns this season, suddenly upped and left Kevin Sumlin’s program.

An immediate upgrade could be on the way for the Aggies, who now appear to be at the top of the list for former Oklahoma quarterback Trevor Knight, who the Sooners granted a full release of his scholarship. Knight, who lost his job to Baker Mayfield, would bring 3,424 career passing yards and 25 touchdowns to College Station and put an end to the bleeding.

Missouri Tigers

You can understand why news of Maty Mauk’s return from suspension this week was greeted with mixed emotions. With Mauk imploding courtesy of suspension that limited him to 654 yards, six touchdowns and four interceptions in four games, confidence in the junior isn’t exactly at its zenith.

Drew Lock replaced Mauk and did about as well as you can expect a true freshman to do behind a porous offensive line and a non-existent running. He threw for 1,332 yards, four TDs and eight picks. Mauk is expected to return and has a realistic shot at reclaiming his job — given his experience and familiarity with the program. But with defensive coordinator Barry Odom taking over as head coach, the Tigers could benefit from an upgrade under center — especially when you considere that Odom has crafted one of the best defenses in the SEC.

Vanderbilt Commodores

Vanderbilt also had a quarterback situation that torpedoed a team’s great defense. Derek Mason’s No. 6-ranked SEC defense (No. 31 in the nation) gave the Commodores offense, which ranked No. 3 in time of possession in the conference, a shot. The offense struggled with Johnny McCrary under center, who finished with 1,533 yards and six touchdowns, but 12 interceptions.

The sophomore eventually lost snaps to freshman Kyle Shurmur, who didn’t fair all that much better with 503 yards. At least he threw more touchdowns (5) than interceptions (3). Mason appears to be ready to hitch his wagon to Shurmur, and Vanderbilt isn’t likely very high on many transfer lists of job-seeking quarterbacks, but an upgrade at quarterback is exactly what would give legitimacy to a team that was able to compete among some of the best this season before its defense could no longer bail out a nearly non-existent offense.