With Buffalo's loss to Tennessee on Sunday coupled with New England's overtime victory over the Jets, the Dolphins now find themselves alone in second place in the AFC East, half a game behind the Patriots.
The Dolphins also now are one of eight teams in the AFC with a record of .500 or better, along with Houston (6-1), Baltimore (5-2), New England (4-3), Pittsburgh (3-3), Denver (3-3), San Diego (3-3) and Indianapolis (3-3).
The Dolphins practiced Monday without cornerback Richard Marshall, who has missed the last two games with a back injury.
Everybody else on the active roster worked, as did running back Jonas Gray, who was on PUP for the first six weeks of the season.
The Dolphins now have 21 days to determine what to do with the rookie — release him, put him on the active roster, or keep him on PUP for the rest of the year.
The Dolphins also worked out a group of players on Monday, most notably former University of Miami tight end Chase Ford.