Heck no. As someone said earlier: Nate may well be an average to slightly-above-average coach. Great for an average- to slightly-above average team. Not so great if you're attempting to win championships by going against the great coaches.
Just as a for-instance: Last year Doc Rivers had one of the better assemblies of talents in the last 10 years. He got taken to 7, 7, 6 and 6 games partially because he wasn't a great coach. He's a smart enough guy to motivate and to hand the D over to Tom Thibodeau, but nowhere close to the Phil Jax/Pop/Van Gundies/Riley level (or in the playoffs last year: Woodson, Brown, Michael Curry).