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Miami is not talented at wide receiver; however, it is even worse at cornerback. The Dolphins field one of the worst secondaries in the league in passing yards. It has allowed 261.7 passing yards per game, which is good for 26th.
The secondary has really struggled against average quarterbacks and has been burned for a lot of big plays through the air. It also lacks the ability to create turnovers, and it doesn't intimidate any quarterbacks.
Sean Smith is Miami's No.1 cornerback after it traded Vontae Davis before the season started. Smith has had some strong games, but is highly inconsistent. That is something you just can't have with your best cornerback.
Miami suffered a setback with the season-ending injury to Richard Marshall, but Marshall had also been disappointing during the time he did play.
If Miami wants to be a true contender, it needs a shutdown cornerback—someone who can be left in an island to fend for himself and get the job done. If Miami can find someone that can turn into that player, Smith won't have to cover the other team's best player.
With Smith as the No. 2 cornerback, the Dolphins have a better chance of being a stronger defense on the backside.