I personally believe success in the NBA has far more to do with the talent level a team can put on the court than coaching ability. I'm quite confident Doug Collins could have won a championship with the rosters Phil Jackson had in Chicago and LA. It's pretty rare that a sub-par team talent wise makes a run to the championship. It's just too hard with a 7 game series. But in march madness, anything is possible.
I am a big Doug Collins fan so you get no argument from me on him. Doug was the guy that changed the culture with the Bulls and set the foundation that Jackson built upon. It was Doug that took over an underachieving/undisciplined Bulls team with the likes of Orlando Woolridge/Quentin Green and turned it into a hard working playoff team with the likes of an Elston Turner in the starting lineup. There is no better argument for how important coaching is in the NBA and any sport for that matter than reviewing what Doug Collins did for the Bulls. More recently look at what happened to the Bulls with Thibs and immediately after with Hoiberg dealing with almost the identical roster. No comparison. You need great talent and great coaching to win in the NBA and any other sport.