The fact that Zadina has requested a trade, really changes the dynamics here.
Honestly, Yzerman probably really did try to get anything of value for Zadina, as long as we are not losing cap or getting significantly worse to do so. I know this is a fact because they just proved it. They waived him to say "ANY team want him for free... go ahead". They didn't do this to throw him away, they are doing this to tell the agent... "Look, if no one grabs him for free, no one wants him." So if Zadina clears... he goes to GR, and he has to work on his game there. No way he doesn't report, or Yzerman will just suspend him. He will keep him suspended, and to my knowledge, his contract doesn't move forward if he doesn't report.. That would mean the end of his career. So Zadina will report.
I fully expect someone to take Zadina for free. But if no one takes him, base case is he spends the year in GR. Waiting for a rash of injuries in the NHL, or another team to change their mind about Zadina.