You’re asking me?They traded Russell because they had to get out of 1 of Mozgov/Deng. They no longer have to get out of Deng. They just have to extend and stretch him.
Why would they trade Kuzma, who is great, just to get rid of Deng when they can just trade Clarkson, who is selfish bench player? Just use common sense and take a second to read any of the articles that have come out about the stretch provision in regards to Deng.