The 6-foot, 208-pounder ran for 1,522 yards on 276 carries with 22 touchdowns last season after rushing for 1,422 and 18 touchdowns in 2013.
As a senior, Diggs logged 73 tackles, three interceptions and five pass breakups. In his four seasons for Texas, he started 49 games.
The 6-foot-, 230-pound Burton played in all 13 games for Rutgers as a fifth-year senior in 2014.
Wright attributed part of his struggles to late notice from Auburn about what his role on the team would be.
To move into the fourth round, the Lions traded their 2016 third-round pick to the Philadelphia Eagles.
The Lions have one pick each in the fifth, sixth and seventh rounds.
The NFL draft is all about the future. Except when legends of the game steal the show, as Jim Kelly, Dick Butkus, Ickey Woods and Rick Upchurch did in the second round.
Carter started 12 games as a junior and recorded 41 tackles, defended 10 passes, intercepted a pass and forced a fumble.
Clark was kicked off Michigan’s team last November after being arrested on assault charges.
The Panthers traded up Friday night to select Michigan wide receiver Devin Funchess in the second round of the NFL draft.