Honestly...although I want Lisa to be found as much as anyone here, and I do believe that DB is responsible, I don't see how we can figure out even the simplest detail because of all the false information running around. Usually in a case, there are a few specific things that we can believe, and can run from there. But, in this case we don't know even the most minor detail as fact.
We don't know when Lisa was last seen, so she actually could have been gone the entire day before that evening. Without that information, everything else is pure speculation.
I initially believed that the brothers saw baby Lisa that day. Thinking they would have confirmed that in their little initial interviews.
But... JI says in an interview that LE, when they had him alone, first tried telling him that DB must have done something. Then...they turn it around and probe him for what he himself may have done during that few hour window he was home between jobs.
So...if JI is telling the truth about LE probing him for that two hour window, at least at that point in the questioning, LE didn't have confirmation that the baby had been seen beyond that time JI was home.
Hope that makes sense. In other words, they wouldn't bother accusing him or probing him about that two hour window if they had independent (credible) information that the baby was seen after he'd left for work.