In some ways, the Miami Dolphins are not exactly sure what they are getting with free-agent cornerback Brent Grimes . Brent Grimes, who was the top cornerback on the free agent market, has agreed to a one-year deal with the Miami Dolphins. “I am doing great,” Grimes said. "I picked Miami because I think they are building something great here, and I would love to be a part of it,'' Grimes said. Patterson’s salary is not guaranteed and it’s probable the Dolphins were just keeping him around as insurance in case they couldn’t land a corner like Grimes. However, if Grimes is 100 percent by the end of the summer and reverts back to the top- player he was a couple seasons ago, Miami could have one of the biggest steals in free agency. After all, the Dolphins only managed 16 takeaways as an entire team last year, including 10 interceptions .