Absent an overpay from the other team, none of our core 4 are going anywhere this season. The Cavs signed who they signed with the hope that improved spacing will make it much easier for the offense to fire on all cylinders.
It would take a team like the Nets or Pelicans getting desperate enough to offer players they don't want to offer, coupled with the Cavs performing below expectations, for Allen or Mitchell to be made available (I don't foresee a scenario where Garland or Mobley would be offered by the Cavs after having traded a half a decade's worth of draft capital).
Some of these proposed Mitchell trades will be available next summer if the Cavs decide to go that route. They're that bad (Zion and Herro ain't it).
The only player I could see asking out is Okoro if he gets buried on the depth chart in a contract year. Rubio and Wade are available as salary filler (unless Rubio retires). I'd like to see us sign Garuba who would be a better rebounder/defender than Stevens was off the bench. But our roster is pretty locked IMO.