Can't really find anything else confirming that Zacha has actually signed. Did see a rant by Shero saying he didn't care if Zacha signed away, but that was it. Waded into the cesspool that is HF boards and the thread on it there said it wasn't the case.
Still, like Mindz said earlier, kind of a reach of a pick to begin with. He did show signs last year of coming around and there was speculation that he could possibly slot in on Hughes wing this year to help with some of the defensive burden this year, but man, he has been a let down overall since he was drafted.