Same goes for Guyton, whom the Patriots made no effort to re-sign. After being a vital role player and spot starter his previous three seasons, the 2008 undrafted free agent disappeared in 2011. Guyton barely saw the field outside of injury/backup situations. Why? After the lockout, Guyton appeared to report in subpar shape. The quickness and athletic ability that made him the team’s best cover linebacker was gone. That was confirmed when the Dolphins signed him to a minimum one-year deal. They are in the process of getting Guyton’s conditioning and body composition back to previous levels. “The ability he showed on film in 2011 was not what it was prior, in ’09 and ’10,’’ the source said. “He’s aware of that.’’