Apparently John Elway isn't done shaking up the roster.
An undrafted free agent out of Ole Miss, Vaughn played primarily as a returner for Denver in 2010. Last season Vaughn chipped in with 20 tackles, four pass deflections and a 55-yard interception returned for a touchdown.
Vaughn went down with a fractured left fibula after playing in only nine games in 2011.
Gronkowski entered the league as an undrafted free agent the same year as Vaughn and played in parts of 14 games with the Dallas Cowboys in 2010. He has only five rushing attempts and seven receptions for a combined 52 yards and one touchdown in his short career.
Picked up off of waivers prior to the start of the 2011 season, Gronkowski appeared in only seven games for the Colts with no rushing attempts or receptions on the season.
After the signing of Florence and fellow free agent Tracy Porter and the acquisition of rookie corners Omar Bolden and Coryell Judie, Vaughn became expendable in Denver. The cornerback needy Colts could use Vaughn extensively at both cornerback and returner in 2012.