I love Steve Kerr, but I have a funny feeling that he will be a top-tier coach as long as he is coaching 2 MVPs and 4 Allstars. Translation: just about any coach would look good with that squad. Frank Vogel would be known as a shrewd strategist, Steve Clifford would show everyone his lucidness.
It reminds me a bit of how Russell was a great coach as long as he was a player-coach.
I repeat, I love Steve.