Murdering an innocent in broad daylight in thier own front yard is a pretty high risk operation. Taking such a risk, in order to send a message to someone else, is not a very likely reason, in my opinion.
JMO: it can happen, but only if the person involved with the “mafia” is “very close” to the victim.
Why I think this version is not true: the target is the source of money, and doesn’t wish anyone to be killed. The murder of Liz is for scare, according to the idea. The true “money target” is not involved, but is to get scared.
However, the murder doesn’t appear like it. In fact, it seems like there is a source of information close to Liz. And, several things converged on Liz during that morning.
First, this yard sale, be it spontaneous or not. Poorly advertised, it seems, but the killers knew about it.
They knew that the Goddard school’s security and wi-fI were down.
They seemed to know that Sergio would be at work. Their timing is excellent.
Liz’s father was supposed to be with her but changed his mind to look for a new job later. They seemed to be aware of it.
They knew enough not to get on the nest camera.
I always wonder if some neighbors could be involved because someone very close had to know a lot, you know. Except for the killers were not great with directions (or maybe they were and just pretended?)
This doesn’t look like “threatening someone close, financially, and killing Liz, to prove their seriousness”.
This looks like, “the killers have an excellent source of information and this source may have no clue”.
I am just thinking that if the most obvious source of information can not be proven to be involved… he may not be, after all.
It could be someone else, very loving and invested, who may, totally unbeknownst to themselves, serve as the source of the information to someone close that they trust.
Liz was not the only child. Someone’s close friend? Was Sergio the only child? If not, what about someone close to his sibling?
It might be Christine Jessop’s version, after all. Someone who happens to be close to either Sergio’s side or Liz’ side during these days and whom everyone trusts.