The more I think about it, I think we'll see a few PTOs signed by the Leafs for camp. As I said before, there's vet requirements for preseason games. IIRC you need 8 guys who have played 30 games last year, or 100 in their career.
I'd bet guys like Tavares, Thornton, Spezza, and Muzzin would appreciate not having to play a ton during the preseason, especially when this season's schedule is a meat grinder. So bring in a few guys on a PTO to meet those vet requirements, and give spare some of our more established guys the trouble. I'd rather see a bunch of rookies and washed up vets this preseason. Give just a game or two for the established roster guys. Don't risk injury or fatigue.
Also, I'm sure someone struggling to get a contract would like the extra exposure that Toronto would give them.
Here's some guys I think might take a PTO. I doubt any would have much of a chance to crack the roster. Grabner, Frolik, Beleskey, Hainsey, Alzner, Condon.