As the NFL draft moves farther into the rearview mirror and the offseason program continues to march on, linebacker Jordyn Brooks remains one of three significant Miami Dolphins veterans looking for a contract extension. And while new GM Jon-Eric Sullivan said at draft time that running back De'Von Achane was not available for trading purposes, he hasn't made the same declaration for either Brooks or center Aaron Brewer (while it's fair to add that Sullivan wasn't asked specifically about the latter two at draft time, he easily could have ended all speculation by adding them to Achane's name). Instead, what we have are Sullivan's prior words that he always would listen if another GM were to give him a call. That's important to remember when it comes to Brooks when we hear or see reports around the league about teams in the market for a linebacker.…