McMahon has some more. Cuban really is funny. First he explains how JB was saying how much he likes it in Dallas and then he left (because of his father). So this next quote related to Irving below gives me huge confidence 
"I'd love to have him stay for sure," Cuban said. "I'd love to have him. I want him to stay for sure, and I think we have a good shot. I think he's happy here. He tells me he's happy here, and I get along great with him.
Mark Cuban - Mavericks didn't get shot at re-signing Jalen Brunson (espn.com)
"I'd love to have him stay for sure," Cuban said. "I'd love to have him. I want him to stay for sure, and I think we have a good shot. I think he's happy here. He tells me he's happy here, and I get along great with him.
Mark Cuban - Mavericks didn't get shot at re-signing Jalen Brunson (espn.com)