Latest article in the paper here says his original agreement was to own the team for five years. The five year agreement was ending, so he was looking to sell, and the arena authority bought the team so it would stay in town. I have no idea if he had a similar agreement in Allen where he promised to own the team for a specific period of time. He was sharing administrative staff between the two teams though. The CFO and the director of merchandise were spending time with both teams. Obviously that won't continue, so that may impact Allen also.
In his defense he spent a lot of money on the team while he owned it. He got the new high definition center hung video scoreboard, he replaced all the boards and glass, made other arena upgrades, invested in a new bus, and didn't skip on equipment and supplies for the players. His hiring and people skills weren't the greatest, and his falling out with Larry Courville certainly did some damage to the fan base (some loved Larry, some didn't, but the way he was forced out certainly turned some people off).
I think the biggest problem was poor customer service, and disorganization among the staff. You ask someone a question, they answer, you follow up with someone else based on that information and you get a different answer. A few days later there is an email or press release the contradicts both.