Aren't we all. It's important enough that Prosecution needs a full day of witnesses to try and fight it.
It may be about contamination by searchers of Danielle's body before LE arrived.
It may be about the way Danielle's body was posed, and related to the Samantha/Avila case.
It may be about evidence that was at the scene (blue blanket ?) that the police ignored and the firemen destroyed.
It may be about evidence explaining how Danielle's body was partially mummified and insect activity slowed ; Which may be related to the Samantha/Avila Case. If so, watch for "Wrapped tightly in a blue sheet like a cocoon"
You are absolutely correct about arsonist returning to the scene of their crime to watch and such behavioral traits, aren't just limited to arsonist.
Don't know if Feldman has found something, or someone on tape, or is just fishing, hoping to find someone, but, if he finds "Avila" lurking in the crowd, it will be well worth his effort. Avila, BTW, would be my wild guess, as to who he is looking for. JMO