I wouldn't characterize him as that. My personal opinion is that Cuban, like any and all of us, care more about our money and bank accounts than a sports team or job, and priortized a nice exit for himself and that he thought he was clever and could have his cake and eat it too, knowing there was a risk of it not happening. But he also calculated that if the Adelson's didn't honor a verbal agreement, he's still okay with the deal.
What I think changes the above calculus is that he never once even considered it a possiblity of what happened. Heck nobody did, everyone thought it was a joke or fake news, it's talked about as the worst, one-sided, bone-headed deal ever. It's essentially a force de majeure event what happened and not something you seriously consider in any way before doing this deal.
With hindsight 20/20 I do actually believe Cuban would not do the deal with the Adelsons. Even if not for the love of Luka and Dallas, for his own brand that's been very tarnished, on a go forward basis. I think he waits it out or seeks out an alternative partner as the money will still be there (as seen by the Boston deal).