I think there's a lot of white washing going on here.
Steve Ross wanted stadium upgrades that would have benefited him financially. The stadium upgrades would have provided more revenue for him, and would have stabilized the value of the franchise he owns (which has failed to appreciate in the five years he's owned the team, whereas the equities market is up about 80% over the same time period).
Ross argued that the stadium upgrades also would have been a public good because it would have brought Super Bowls to South Florida. Therefore, the public should share in the cost of the upgrades in order to pay for this public good. Steve Ross priced the amount of the public good that the stadium upgrades would have done at about $200 million. That's the amount he wanted the public to pay because it would have been a public good. For him to pay the entire bill of the stadium upgrades, he would have been in essence "donating" $200 million to the city of Miami, in his eyes.
The city and state rejected his bid for public financing. As a result he's giving that $200 million to the University of Michigan.
The Dolphins have an absentee owner who lives in New York and is rarely "in the office" down in Miami, a man who gives more in charitable donations and goodwill to the University of Michigan than to anything connected with the city of Miami, a man who once tried to buy the New York Jets and who owned a USFL team in Philadelphia.
His heart is clearly not in Miami. I'm not saying there's anything wrong with that. It is what it is.
My theory is that with the Dolphins turning out to be such a bad investment, and with his heart clearly not being with the city and with the team, selling his stake in the team to someone else and cutting his losses (or failure to gain anything) is inevitable.