Or maybe they weren't wanted back? Also most of those guys barely played for the Leafs.
Thornton - Maybe the worst "everyday" player (he was never I healthy scratch) I have ever seen in a Leafs jersey, they couldn't have possibly wanted him back could they?
Rittich - short term insurance and barely played, they wanted someone better to platoon with Campbell
Nash - played two games as a Leaf, I'm a little surprised they didn't try to keep him but he's old/injured and we found a younger and healthier version in Kampf
Foligno - was hurt then played like a mediocre 4th liner when he was in the lineup, I'm sure they had some interest in bringing him back but no way to compete with the Bruins offering 2x what he's worth.
Galchenyuk - Still unsigned, 2 teams walked away from him in the last season, it was a nice little story but he was useful because he was hungry - while still being terrible defensively. Hard to see that continuing long term. Likely europe bound unless he can earn a shot somewhere off a PTO
Hutton - Not sure what's going on there - the guy left the team for personal reasons at the end of the year/playoffs and is still unsigned. He was good in Anaheim and looked decent here in the little action he got. I wouldn't mid bringing him back but like I said, seems like there's some non-hockey related stuff going on with him.