Mazzulla's Panic Sub: Why Put a Non-Shooter on the Floor for Game-Tying 3?

I keep seeing people praise Mazzulla's "genius" substitution of Hugo Gonzalez in that overtime possession, but let's break down what actually happened here. Why was Amari Williams - a non-shooter - even on the floor when you desperately need a three? The panic sub worked, sure, but watch the film. The Nets had zero organization on defense, Pritchard looked completely lost, and what followed wasn't any drawn-up play I've ever seen. Sometimes chaos works in your favor, but calling it brilliant coaching? That's a stretch. The real question is why it took until the last second to realize you had the wrong personnel out there.