He is free to quit. He is not free to move on. No lawyers are needed.
If he sits out the year he would still be a GCS player but could walk as a free agent.
This, I don't understand. I thought he still had a year to run on his contract. So, when I buy a new car on a three year deal, I'll pay for the first two, and tell the finance company that I'm not going to drive it in year three, because I'll be overseas, and that'll be OK with them?