All transfers are unique.

Playing time concerns, disciplinary issues, loss of that desire -- each have explained most of the departures from the Alabama football program in Nick Saban's tenure. Five members of the 2015 signing class have already moved on from Tuscaloosa.

Should they succeed at the next stop, they'll be the exception to the trend. NFL success has been practically non-existent for the Alabama transfers who came before them. Of the 22 who signed since 2008, transferred and completed eligibility, none were drafted.

Only one, Corey Grant, has ever seen the field in an NFL game. Other than him, Travell Dixon is the only other in training camp this August. Neither Grant nor Dixon played a snap at Alabama.

Most who left were in the bottom half of their respective recruiting classes who faced long odds for Alabama playing time. Others -- Star Jackson, B.J Scott and Dee Hart -- were marquee names on National Signing Day.

Not everyone became total busts at the next destination. Hart and Scott both had solid second acts at Colorado State and South Alabama, respectively. Defensive lineman Darrington Sentimore and quarterback Phillip Sims went on to start at Power Five schools. Phillip Ely threw for nearly 3,000 yards last season at Toledo.

A few of the more recent departures have a shot at a success moving forward. Running back Alvin Kamara emerged as a real threat in Tennessee's offense last season. Chris Black appears to be in line to start at Missouri this fall. The same is true for quarterback Alec Morris at North Texas.

After the recent high-profile departures of Maurice Smith and Kendall Sheffield, we took a look back at each of the players who transferred from the eight full signing classes recruited by Saban.

This list, separated by recruiting class, includes only players who transferred on their own. It does not contain those who were dismissed from the program or were medically/academically disqualified.

2008 (6)

-- WR/DB B.J. Scott: One of the top recruits in the 2008 class, the five-star prospect transferred to South Alabama. As a senior, he was third in tackles with 83 as a defensive back. Pro careers in the NFL and CFL didn't materialize.

-- DB Alonzo Lawrence: Transferred to Southern Miss and eventually Mississippi Gulf Coast where he was a JUCO All-American. He bounced around the Canadian Football League for a few seasons. As a Toronto Argonaut, Lawrence was named CFL defensive player of the week after his first game.

-- QB Star Jackson: Transferred to Georgia State but left the team a year later.

-- RB Chris Jackson: Transferred to Georgia Tech and became a receiver. He caught two passes as a senior for 42 yards.

-- RB Jermaine Preyear: Transferred to Alabama State.

-- P Corey Smith: Transferred to West Virginia where he punted 116 times in 2011 and 2012. He averaged 42.6 yards in his final season.

2009 (4)

-- DL Darrington Sentimore: Went to Mississippi Gulf Coast before heading to Tennessee. After a big junior season in Knoxville, Sentimore went pro but went undrafted. As of August 2015, Sentimore was a training to be a police officer in Jefferson Parish, La.

-- LB Petey Smith: Transferred to Holmes Community College in 2011.

-- FB Mike Marrow: After redshirting, Marrow went to Eastern Michigan before heading to Nebraska where he spent time as a reserve fullback.

-- DB Rod Woodson: Transferred to North Alabama.

2010 (3)

-- QB Phillip Sims: Started at Virginia before transferring again to Winston Salem State. Spent time with the Arizona Cardinals and Seattle Seahawks and Saskatchewan Roughriders of the CFL this summer but didn't make the roster.

-- OL Chad Lindsay: Went to Ohio State but never played after getting injured in the 2014 preseason.

-- WR Keiwone Malone: Had 125 receptions for 1,497 yards and nine touchdowns in four years at Memphis (2011-14)

2011 (8)

-- WR Marvin Shinn: Caught 19 passes for 335 yards and one touchdown as senior at South Alabama in 2015.

-- RB Dee Hart: Ran for 1,275 yards on 194 attempts and 16 touchdowns in his one season playing for Jim McElwain at Colorado State in 2014. Hart went pro with another season of eligibility but went undrafted and was cut by the Dolphins after getting a tryout.

-- WR Danny Woodson: Caught 19 passes for 253 yards and one touchdown as senior at South Alabama last year.

-- TE Malcolm Faciane: Played in 11 games, started one at UT Martin in 2015. He caught one pass for six yards.

-- RB Corey Grant: After redshirting one season at Alabama, Grant finished at Auburn. A career 1,000-yard rusher, Grant went undrafted in the NFL but was picked up by the Jacksonville Jaguars. He played six games with Jags last year, caught two passes for 13 yards and rushed six times for two yards.

-- LB LaMichael Fanning: An All-OVC player in 2014, Fanning started 10 of 12 games and made a team-high 4 sacks, 32 total tackles. He tore ACL first game 2015 and the NCAA denied an appeal for a sixth year of eligibility for 2016.

-- WR Ronald Carswell: Transferred to Itwamba Community College, then West Virginia where he caught 20 passes for 413 yards. He was then suspended and landed at UT-Martin.

-- QB Phillip Ely: Started at Toledo last year, 226-for-403, 2,965 yards, 23 TD, 10 INT. Went to Bucs rookie mini camp and is now a defensive graduate assistant for Iowa State.

2012 (3)

-- WR Chris Black: A former top recruit, Black spent four seasons at Alabama before transferring to Missouri before this year. He appears to be in line to start this fall, according to the Columbia Tribune.

-- QB Alec Morris: A four-year reserve, Morris went home to Texas as a graduate transfer. According to the Denton Record-Chronicle, Morris is "clearly" the starter this fall.

-- DB Travell Dixon: A junior college transfer, Dixon spent only the spring of 2012 in Tuscaloosa before transferring to Washington. He started one of the 16 games with the Huskies. Oakland signed him and waived him in May 2015 before Carolina picked him up in January. He's currently in training camp.

2013 (4)

-- RB Alvin Kamara: Of the transfers currently in school, Kamara has had the most post-Alabama success. After a season at Hutchinson Community College, he became the No. 2 back at Tennessee last season. Kamara ran 107 times for 698 yards with seven touchdowns. After redshirting at Alabama in 2013, he has two years of eligibility left.

-- DL Dee Liner: The former Alabama reserve will be eligible to play this season at Arkansas State after sitting out last season because of transfer rules.

-- RB Altee Tenpenny: Passed away in an October 2015 car crash. Tenpenny transferred originally to UNLV in 2015 before landing at Nicholls State.

-- QB Parker McLeod: Left Alabama after one season, sat out 2014 as a transfer at Western Kentucky before leaving the team. He enrolled at Georgia this summer where he'll be a walk-on for Kirby Smart's Bulldogs.

-- DB Maurice Smith: Transferred to Georgia in August and is eligible to play this fall as a graduate transfer.

2014

None

2015 (5)

Shawn Burgess-Becker: Transferred to UCF

Daylon Charlot: Transferred to Kansas

Kendall Sheffield: Transferred to Blinn College (JUCO)

Adonis Thomas: Transferred to Northwest Mississippi Community College

Christian Bell: Transferred to Wisconsin