The biggest disappointment is Mitch Marner.
Specifically the fact he's still on the team. I'm not sure who to blame for that. A combination of Treliving's shortcomings and the player himself.
It's disappointing they keep bringing him back every year.
Don't get me wrong I think Marner is a good player. But like Kessel before him he's a complimentary piece. A lot of empty calorie points makes him great to have around once the real stars are on the team.
But for the price he commands Marner should be doing it all himself.
That means not riding shotgun with an $11M centre. It's frustrating to see him earn so much and still needing support like that. Let him go earn eight figures riding the coattails of some other teams star players.
The most disappointing thing they could do is re-sign him now.