From the "Baggage Policy for Pass Travel" document in FT. (Pretty easy to find.) Silver Status probably won't be a player; but they can ask at the counter.
Checked Baggage for Regular Buddy Pass Riders:
Regular buddy pass riders, who are traveling on or after Oct. 1, 2014 regardless of when the booking was created, will be charged all checked baggage fees. Buddy pass riders will pay the same baggage fees as revenue customers and the fees will be assessed regardless of cabin booked or flown and apply to all destinations