Unfortunately, Cuban is known for not retaining a role player. He is always focused on the main core. Kind of, rushing things while building up. A famous one is when he destroyed their championship lineup, the season after they get their first NBA title. I never forget his bad move about that as a long Mavericks enthusiast lol. And he always does that kind of moves every season although I like the last one which is transferring DSJ to Knicks as I noticed, this guy's chemistry with Doncic is not that good.
They defeated a strong Miami back then, he should've keep them for another year.
It is like the story of the Bulls when they changed their GM at The Last Dance film.
Also on the brink of breaking the team.
Now, he could remain hot if they will put him on the main core.
He really shine there with his defense.
Cuban may knew he already had an offensive guy in the name of Doncic and now he is just looking for role players for their weaknesses which is defense.