Versteeg went to the Oilers camp in 2016 on a PTO and turned down a roster offer by the Oilers to sign with the Flames and ended up being the #5 forward on the Flames when they made the Playoffs.
The PTO is an opportunity for the player to showcase himself and give some proof that he has overcome his injuries from last season. He picked up a lower body injury in the
off season Then started the season and blocked a
shot that shut him down for a month
He wore an A with the Flyers and the Flames may be stocking up on character players.
Stone probably goes somewhere on a PTO if he has any miles left in his body.