Ken Holland would never ever trade Z but even if he was willing to, who would want him? I still think he is a decent 2C but no team wants him at a 6 million Cap hit for next 4-5 yrs. At this point despite him still being a decent/good player, he has little to no value as his contract makes him unmovable.
If Detroit did trade him we would have to give up assets to move him (Which once again Holland wont do) and still we would be hit by Cap recapture so making it useless to trade him
To sum it up he is not being traded lol.