If I recall, D'Antoni's defenses have never been anything to write home about. He's also never led a team to the NBA Finals, much less win a title. I'm sure the team's offense would be better under him, but I don't know that the team would go farther.
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Houston's had a couple of good defensive seasons under D'Antoni, but he's much more offensively-oriented, for sure.
I think if we're waiting for a title-winning coach to be available it's going to be a very long wait. D'Antoni would be a good fit, I think, but I can see why some people aren't excited about him (Harden-ball was an absolute eyesore).
I'm pretty sure most people enjoyed Nash-ball. Not sure why are people ignoring that completely because he coached under a very rigid analytical front office.
Because that offense was completely dependent on the individual brilliance of Steve Nash and cannot be replicated without a PG of similar talent & mentality.
D'Antoni's offenses in New York, LA and Houston are more telling.
To be fair MDA did some fantastic work during those years with Nash's sidekicks - Joe Johnson was a '3 and D' wing who shouldered a considerable offensive load in '05 as the secondary ballhandler on that team, Leandro Barbosa blossomed into a great sixth man who was a viable isolationist and high-level spot up shooter while Boris Diaw developed into an elite passing big man with a versatile post game. A lot of Phoenix offence was due to Nash, but MDA did an excellent job at developing Phoenix's young talent into impact players on high-level teams to amplify Nash's brilliance. I would love to see him do something similar with players like Jaylen Brown, FastPP, Robert Williams, Grant Williams, Romeo Langford, Aaron Nesmith, whoever we select at #16 assuming we use the pick, etc while refining Smart like he did with Raja Bell.
As for his work with New York, Los Angeles and Houston, I think the argument that he coached two black holes and worked under a very rigid front office is just as valid as your concerns about the replicability of those Suns attacks. I just see a coach who can develop our young talent and find a way to build a high-octane offence without the hindrance of egotistical black holes or a front office that is insistent on playing a ruthlessly efficient brand of basketball that looks static and soulless to the average basketball fan.