Tim Reynolds of the Associated Press noted the roster move:
Quinn was brought in to compete for a backup quarterback job behind Ryan Tannehill. His bid never really got off the ground, however, as he attempted just four passes since being signed. He didn't feature during the team's third preseason game.
It appears the Dolphins will move forward with Tannehill and Matt Moore as their quarterbacks with Seth Lobato as a possible development project.
Matt Lincoln of CBS 12 clearly expected the release at some point before final cuts:
Quinn thanked Miami for the opportunity:
Ultimately, it may be the end of the road for Quinn at the NFL level. He appeared in 24 games between the Cleveland Browns and Kansas City Chiefs after being drafted with the 22nd overall pick in 2007. His career quarterback rating is below 65.
He was preparing for the next phase even before signing with the Dolphins, though. Chris Strauss of USA Today reported last month that the quarterback had signed on to work as an analyst with Fox Sports for both the college and pro games.
Quinn may wait until the dust settles following the massive amount of cuts on the horizon to see if he can land with another team before heading back to TV. But it would be a surprise if he got another chance at this stage.
His skill set didn't translate to the NFL level.