Cuban has sold the Mavs to Adelson-Dumont Family

[Jason Terry]

These are good questions. It's reasonable to assume both parties have ultra-smart people to examine the what-if's, and then figure out how to structure the deal so they both have fair protections.

"There has to be protection in the documents for them to not just be Cuban’s piggy bank" -- 
a. Yes, their protection is in the sale docs, which will define the terms of the partnership, and the consequences of the interest that Cuban still retains.
b. The idea that Cuban has "control" is looking like sloppy reporting, because Adelson (not Cuban) will be the 'Governor' of the team, making  Adelson (not Cuban) in charge in all NBA matters. 
c. Generally, it sounds more like his role of running the team is a job he is filling (at least for the time being), instead of them, because they think he is capable and they are not.
d. As far as his ability to get into their pocketbook, there are partnership norms that probably come into play that help. For example, let's say the ownership is a 60 (A)- 40 (C ) split. If/when Cuban wants more cash money injected into the team to do this or that, or the cash flow comes up short (say for big contracts, or luxury tax) then he would have to bring 40% of it himself. (He starts off with over $2B in cash on hand, minus taxes, which should allow him the opportunity to spend if he wishes.) And as an underling, it's close to certain his spending of team money will be audited, he will get a designated salary, and he can be fired for mismanagement if they ever feel the need.

On the casino question, that may be a tougher nut to crack than they hope. At the same time, they may be banking on the idea that IF the laws in Texas change, they may be creating a head start for themselves at being 1st in line for a casino (or even 5 or 10, eventually).

I wonder when the terms of the partnership will become public

it’s an interesting dynamic between both parties. I think it will sound fair and make sense in a Cuban way like most of his deals

Cuban has the Mavs franchise which inherently has a connection to the city/county/state government.

Adelsons have the $ and the casino/real estate development business connections and experience 

Put it all together and they have all the ingredients needed (as long as they can pay off the government so they will steal from the citizens) 

The Adelsons must understand how important the Mavs are to Cuban. He would not sell the team unless his demands in that way were met first and foremost. He has said his kids will not run it. Something like he keeps being final decision maker on basketball moves and has a similar role to what he is currently for X number of years. Until 75, so 10 more years to enjoy it? Or maybe with a stipulation that he runs for POTUS and gives up control at that point? 

But the NBA “business” side of it i think will transfer quickly so they can start paying for what’s needed. Giving up the 51% assures the Adelsons will own the Mavs long term in every way. Cuban gets the temporary special treatment demands met. In return, the Adelsons get the discount in valuation. Cuban keeps the 49% so he can sell it down the road for much more than he sold the 51%.