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Of course, this can change at any moment, but presently it doesn't look like Vernon Carey will be rejoining the Dolphins in 2012.
This is actually a big deal in a lot of ways. Carey hasn't been the best offensive lineman in Miami's history, but he's been versatile and is a talent they'll need to replace immediately. The reason they moved Carey to right guard in the first place was because the team's options were terrible.
Now, they're minus the patch that made the hole okay in the first place. Drafting DeCastro will plug it up immediately, and let the Dolphins find some way to address other missing pieces with later picks or in free agency.
Right now, the Dolphins are possibly losing two starting offensive linemen from last season in Carey and Marc Colombo, and the only acquisition so far has been Artis Hicks. Without a good pick here, the Dolphins could be without a guard again in addition to no quality depth for injuries in 2012.