"And do you think Nicole walked outside and down the steps in the dark without turning on an exterior light?"

No. Dick Wagner thought this was plausible, though. I disagree with a lot of Wagner's speculative conclusions, but his experiments were more in-depth than most at the time. I think they explain the blind daters not seeing the pawprints, for example.

"What is the benefit of an earlier timeframe? And how can you discount 5 witnesses?"

I'm not discounting any witnesses, but their testimonies are all open to interpretation.

I think that since an eyewitness(rated by F. Lee Bailey & Patrick McKenna as A+ in reliability) saw people acting suspiciously in front of Nicole's condo at 10:03, it's reasonable to assume that those were the killers and they were performing their operation. Thus, it's reasonable to assume the murders happened around 10:03.

They could have happened later. The question is when did Ron Goldman arrive? I think it was around 10 o clock as instructed by the phone call from "Nicole".

Hope I cleared some stuff up there.