From Jason La Canfora of NFL.com:
Jaguars WR Mike Sims-Walker will play Sunday against the Dolphins, shocking the team, which expected him to be inactive.
The team’s top receiver had been out of practice all week with a calf injury. He was able to run during warmups and felt good enough to play, a very surprising turn for the Jaguars, with coaches and team officials bracing for being without him today for a critical game with the Dolphins.
DT John Henderson and CB Rashean Mathis are out for the Jaguars, as expected. Sims-Walker, Henderson and Mathis all had been listed as doubtful.