I think after Luka stonewalling Kidd made me think it was plausible that Kidd may have known and been okay with it. How okay with it? Getting more then what they did for starters lol. Kidd and Nico were also pretty close as well. But if you believe Bucks fans he also wants to take President of Basketball Operations jobs at teams like the Bucks etc.
Ideally, Dumont should have been the one to be the first to take accountability as the top man like the new Suns owner and then fire Nico for his failure in suggesting the trade to him as an internal matter. But Dumont is not made of that stuff, clearly. But I guess the difference is Dumont doesn't want anything to do with basketball, hence why Masai is alternate governor, his MIL made him the owner and the team was so good and he attributed that to Nico. Nico sweet talked him into pushing Cuban out and he listened because he just raised a WCF trophy.
Now they're all gone lol.
As it was mentioned earlier though, a lot of the Mavs issues were pointed towards Nico. Not just the move, but the stuff with the medical staff, getting offside with long term loyal staffers and eventually letting them go etc. All related to the power struggle within the organisation