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Either Justin Smith or Bryant Young has been a mainstay on D-line since 1994

The retirement of defensive end Justin Smith this week did more than weaken the San Francisco 49ers, both on the field and in the locker room. It also severed a line that went back to the first Clinton Administration.

The last time that neither Smith nor Bryant Young was a mainstay on the Niners' defensive line? Try 1993. That the Niners have won one Super Bowl since then matters little for this discussion.

So with the Niners concluding their first session of organized team activities Thursday, there is no doubt a different feel among the defensive linemen, let alone the entire team with a rookie coach in Jim Tomsula.

After Thursday, the Niners, who now have a full 90-man roster, have OTAs May 27-29, June 1-2 and June 4-5, with a three-day mandatory minicamp June 9-11.

The following is an updated look at the 49ers' offseason thus far, a spell that earned them a D-plus grade from ESPN.com NFL Insider Mike Sando, the lowest grade in the NFL:

Arrivals

RB Jarryd Hayne -- Australian rugby star chose the Niners, who he said gave him $100,000 guaranteed on a futures/reserve contract, over the Detroit Lions and Seattle Seahawks to begin his American football adventure and plans to play running back and special teams ... if he makes the squad.

DL Darnell Dockett -- Former Arizona Cardinals Pro Bowler stays in the division to fortify D-line, which will already be without Ray McDonald and Justin Smith, with two-year, $7.5 million contract.

WR Jerome Simpson -- Acrobatic wideout known for his forward somersault TD for Cincinnati and his legal issues signed to two-year deal.

WR Torrey Smith -- Five-year, $40 million contract with $22 million guaranteed brings big and fast deep threat who could be the yin to Anquan Boldin's yang ... like they were in Baltimore when the Ravens beat the Niners in Super Bowl XLVII.

RB Reggie Bush -- No. 2 pick of 2006 draft signs one-year contract to return to California as the San Diego native and USC product will be part of a three-headed Niners rushing attack, along with Carlos Hyde and Kendall Hunter.

CB Shareece Wright -- Started his last 27 games with the San Diego Chargers but has also led the NFL in defensive pass interference penalties since 2013.

OL Erik Pears -- Eight-year NFL veteran who spent past five years with Buffalo Bills signs two-year deal, $4.7 million contract to compete for left guard spot (Pro Football Focus gave him a -25.0 grade last season, 76th of 78 guards) and/or provide depth at right tackle.

LB Nick Bellore -- Special teams ace who led New York Jets in special teams tackles in three of the past four years as an undrafted free agent out of Central Michigan. Has played in all 64 games since entering the league in 2011, though has yet to start one.

LB Philip Wheeler -- Started just two of 15 games last season for the Miami Dolphins after starting his previous 32 games, 16 in Miami and 16 in Oakland, at weakside linebacker in 4-3 defenses.

Departures

RB Frank Gore -- Heart and soul of team will now run the ball for the Indianapolis Colts and block blitzers for Andrew Luck for three years and a guaranteed $8.5 million.

LG Mike Iupati -- Three time Pro Bowler moves to Arizona on five-year, $40 million deal with $22.5 million guaranteed to form a formidable left side of offensive line for Cardinals with left tackle Jared Veldheer.

LB Dan Skuta -- Key backup the past two seasons who has started 18 of 30 games; he's off to the Jacksonville Jaguars on a five-year, $20.5 million contract.

LB Patrick Willis -- Spiritual leader retires at age 30 after eight seasons, seven Pro Bowls and five All-Pro selections due to sore feet and a desire to move on.

FS Bubba Ventrone -- Retired to take job as assistant special teams coach with Super Bowl champion New England Patriots.

WR Stevie Johnson -- Released in cost-cutting move, signed three-year, $10.5 million deal with San Diego Chargers.

CB Chris Culliver -- Took his career-high four interceptions from 2014 and legal issues to Washington with a four-year deal worth up to $32 million.

CB Perrish Cox --Took his team-leading five interceptions to the Tennessee Titans on a reported three-year, $15 million deal.

LB Chris Borland -- Stunned Niners and NFL by announcing his retirement after one standout season, citing potential future health concerns.

RT Jonathan Martin -- Waived after starting nine games in his lone season with the Niners last year. Claimed by Carolina Panthers.

CB Corey Fuller -- Waived after being signed to practice squad last December and being active for one game, though he did not play in the season finale.

QB Josh Johnson -- Despite having a skill set more closely resembling starter Colin Kaepernick's than that of Blaine Gabbert, Johnson was allowed to leave Santa Clara as he signed a one-year deal with the Cincinnati Bengals. Johnson spent the 2013 season with the Bengals.

WR Michael Crabtree -- Visited Miami Dolphins and Oakland Raiders, signing with Bay Area rival Raiders.

WR Trindon Holliday -- Released by Niners.

G Fouimalo Fonoti -- Waived by Niners.

WR Lance Lewis -- Waived by Niners.

LB Chase Thomas -- Waived /injured by Niners.

DL Justin Smith -- If he could not play at the level he was accustomed to playing, it was time to move on. So he joined Willis and Borland in retirement.

Staying put

QB Blaine Gabbert -- Lone Niners QB to throw a fourth-quarter TD last season agrees to two-year, $2 million deal to return as Colin Kaepernick's backup.

TE Garrett Celek -- Signed to a one-year deal.

LS Kyle Nelson -- Signed to four-year deal.

TE Derek Carrier -- Signed a two-year extension.

CB Chris Cook -- Re-signed to a one-year deal.

LB Desmond Bishop -- Became more appealing to the Niners with only three inside linebackers with NFL experience under contract after retirements of Willis and Borland. Bishop purportedly beat out the likes of Lance Briggs and Erin Henderson and signed a one-year deal to return to Niners.

In limbo

WR Brandon Lloyd

RB Alfonso Smith

RB Phillip Tanner

WR Kassim Osgood

Draft picks

DL Arik Armstead (Oregon)

S Jaquiski Tartt (Samford)

OLB Eli Harold (Virginia)

TE Blake Bell (Oklahoma)

RB Mike Davis (South Carolina)

WR DeAndre Smelter (Georgia Tech)

P Bradley Pinion (Clemson)

OL Ian Silberman (Boston College)

T Trent Brown (Florida)

TE Busta Anderson (South Carolina)

Undrafted free agents

QB Dylan Thompson (South Carolina)

WR Dres Anderson (Utah)

WR Issac Blakeney (Duke)

WR DiAndre Campbell (Washington)

WR Darius Davis (Henderson State)

WR DeAndrew White (Alabama)

OL Patrick Miller (Auburn)

DL Marcus Rush (Michigan State)

S Jermaine Whitehead (Auburn)

CB Mylan Hicks (Michigan State)

OL Justin Renfrow (Miami)