Adelman has left the Rockets. He is one of the best coaches in the NBA. He has gotten the most out of his players for years, and overachieved frequently. The Rockets were significantly better than the Knicks this year, despite no stars and a 6'6" center. He was 2nd for coach of the year 4 times.
Who would rather have him instead of D'Antoni? He's handled stars before, done well to develop young players, and has had great success in many different cities.