IMO the 1-5 people JW appealed to may or may not have direct knowledge of what happened to Heidi. They could be people who unknowingly disposed of evidence and moved Heidi's car at the behest of someone else.
The photos of the garbage chute at H + F with the trash piled up next to it in the hallway, leads me to believe that a petite woman could fit inside intact (or not) and subsequently be buried under debris in the dumpster at the bottom, that may be compacted prior to pick up. Depending on what day the dumpster is emptied, it probably was gone by the time LE got inside the building.
I don't think that Heidi was in fear of her life when she was captured on CCTV walking her dog in the alley, or she could have departed the area right then and there, getting her purse and car back would not have been her highest priority at that point in time. IMO this will prove to have been a clumsy, panic driven cover-up of a homicide that occurred in the heat of the moment.
IMO based on the SEC filings, JS is at the very least conniving, greedy and manipulative and I have to wonder if he is the successful businessman he purports to be, since the $9MM he netted was used to buy luxury items and shore up other businesses he owns. As the song goes, "A man with a briefcase can steal more money than any man with a gun" (Don Henley, Gimme What You Got). That said, what goes around, comes around, i.e. Alex Murdaugh.
I am optimistic LAPD will find what they are looking for at the dump and justice for Heidi will prevail. My heart goes out to her young son and her family.
The foregoing is strictly my opinion.