The Celtics could have won the title and Danny would have stepped down regardless. He's a tired man, I wouldn't read anything else into it.
As for Brad, this feels an awful lot like it was more about Wyc being cheap than anything. Brad was already owed a lot of money. What better way to save money than hire a guy you are already paying regardless. He'll get his shot, though, so I hope he comes through.
The team averaging $90 million in revenue profit and who's franchise value increases at well over $100 million a year on average wants to save $4-5 million a year for a few years and make the guy who, in your opinion, they should be firing the guy running the entire show?
There isn't a large corporation in the world that would do something so dumb. Basically Wyc would be saying something like this as a comparison:
"Hey, you're a high level accountant in my firm and I don't think you are doing a good job and need to be replaced, but by firing you I might be sacrificing a 1-2% increase in my bottom line, so instead of firing you, I am going to promote you several rungs up the corporate ladder and make you the Chief Financial Officer of the firm and let you run the company."
That makes no sense in any business world. Wyc and his partners aren't idiots. This simply is not what is happening here.