Austin is a very versatile athlete. He is strong enough to handle defensive backs, and also has quick feet, making him a good return man.
Miles finished last season with 13 catches for 278 yards and three touchdowns, along with 29 kick returns for 624 yards.
The Dolphins are extremely weak at the wide receiver position. Tedd Ginn, Jr. is an upcoming star, but he lacks a teammate that can attract attention away from him.
Miami can make him an offer, but the Cowboys will have the chance to match or beat that offer.
If the Cowboys choose to let Austin go, they are losing one of the most underrated players in the league. Miles may not like it in Dallas because they decided not to use him as a top receiver, even though his skills earned him at least a shot.
Add the loss of Miles to the possible release of Terrell Owens, and you have a receiving corps led by Roy Williams and Patrick Crayton. That duo isn’t terrible but it's a lot different than T.O., Williams, Crayton, and Austin.