Cousins was in the middle of a media session that was being filmed when he was told of the trade. Did Vlade try and contact him and couldn't, so then contacted his agent? I don't know. Was the person that came and whispered in his ear that he had been traded a surrogate of his agent? I don't know. If Vlade did try and inform Cousins, then he should make that public. Was the entire thing handled poorly? Yes, it was! Were there circumstances beyond Vlade's control? Maybe, but I don't know.
What I do know is that Cousins agent was informed that the Kings were shopping Cousins, because he contacted many of the teams that were interested and told them that Cousins wouldn't sign an extension with them. If Cousins agent knew, then I think we can assume that Cousins knew. Did Vlade say that he wasn't going to trade Cousins? Yep, sure did. And every time I hear a GM say they're not going to trade a player, the first thing I think of is, they're going to trade that player. That's usually now it works. That's how a team tries to raise the asking price.
I try and look at every trade or signing from the point of view of whether the team is better or worse because of it. When the return is youth and draft picks, it's impossible to know for sure what the long term result is. How do you compare in the long term, the unknown results of unknown players, except for Hield to a player like Cousins. Obviously Cousins is better right now than Hield or any player the Kings draft. But three years from now, who knows? So if your a Cousins fan, and your upset, I get it. And I suspect that if the trade had gone down smoothly without a hitch, you'd still be upset. All the mishandling did was add more fuel to the fire.