At the end of last season, Z was at major odds with the Cavalier managment. It seemed they were way off on money and that they weren't too interested in re-signing him.
Then they hired one of Z's first friends in basketball, Danny Ferry, to be the GM. That went a long way to bridge the gap.
Now they traded for Martynas Andriuskevicius, a kid from Z's hometown who shares the same agent. This could do a lot to help re-sign Z.