By Omar Kelly, Staff writer

5:26 p.m. EDT, June 3, 2013

– Rookie offensive lineman Dallas Thomas was allowed to participate in position drill with the Miami Dolphins for the first time this offseason on Monday. ...

The Dolphins envision Thomas as the offensive lineman who serves as Jonathan Martin's backup at left tackle, and Richie Incognito's backup at left guard. Thomas played both position for the Volunteers. ...

Brent Grimes has spent every practice session as Miami's starting cornerback, and it appears he's completely recovered from the Achilles injury he suffered in the season-opener playing for the Falcons last season. ...

Don Jones, the Arkansas State safety the Dolphins selected in the seventh-round, was playing safety during Monday's OTA session. Miami drafted Jones with the intentions of using him as a cornerback, but might be changing their minds….