Reports then surfaced Friday morning that Rosen had unfollowed the Cardinals' social media pages on Instagram and Twitter.
Rosen's rookie season in Arizona had more than its share of ups and down, as the Cardinals struggled en route to a 3-13 record, which led to the firing of head coach Steve Wilks. Rosen finished the year appearing in 14 games with 13 starts, completing 217 of 393 passes (55.2 percent) for 2,278 yards and 11 touchdowns against 14 interceptions. He was sacked 45 times and posted a 66.7 passer rating.
Still, the trade for Rosen signals the Dolphins expect the second-year pro to immediately compete for the starting job.
Rosen now has the distinction of becoming the highest-drafted quarterback before turning 23 years old in the Common Draft Era. The previous high was Brett Favre, who was the 33rd overall pick with the Atlanta Falcons in 1991.
Rosen also becomes the first quarterback selected in the top 10 to be traded within his first two profession seasons, excluding players traded prior to rookie season.
Shortly after the trade, the newest Dolphins quarterback immediately followed his employer on Instagram.