Coaches are hard to figure. There's not many decent ones available, and mixing it up with 2 upper tier players on your team with big salaries, during your limited window of opportunity, could be too risky.
Look at what's out there. The Thunder went to a college coach to avoid hiring a journeyman black player/coach. We both know that. You have Monty Williams, Avery Johnson, Jacques Vaughn, Mike Brown and maybe soon Derrick Fisher and I am sure I'm leaving someone out. Then you have Scotty "just go out there and play hard, you guys know how, just go do it" Brooks, Vinny "off the face of the earth "Del Negro, that got that was coaching SAC prior to Karl, have no idea where Nate McMillan went... and I am sure Steve Nash will be throwing his hat into the ring sooner or later.
Pick one.