I can't claim to understand the business or financial side of things, but I'm not sure why the league frowns on ownership groups and prefers one owner in a massive deal like this. Especially with the arena deal looming overhead.
If the money is there, then it's there. Who cares if comes from several rich and powerful entities as long as theres a clear majority owner thats safe and stable. And your not putting all of your eggs into one basket this way either. You would think selling a share of the team and/or buying a minority owner out if need be would be far easier to mitigate than the problem of one single owner falling on hard times.
Strength and stability in numbers, no?