Was it that his defenses overall were that good or was it that Knott/Klein covered up a lot of issues that came to the surface when we no longer had someone of their talent?
That is like asking is Hoiberg that good or did getting players like White, Kane, and Georges cover up what we saw in Year 1?
Most coaches are not good if they have inferior talent and get better with better players. Given Knott, Klein, Georges, Smith etc were not major recruits or even what most programs consider overly talented, and were only one or two players out of 11, I'd say it was Wally. Look at what he did in Year 1 compared to what those guys did under Bolt. The fact that if you give him even a couple good players he can put out a serviceable defense is impressive. I'd like to see this defense in Game 6 with Coe, Irving, Ayeni, Iron, and Cotton-Moya.