I'm pretty sure investigating all parties involved is standard operating procedure for murder investigations. Officers, detectives, etc. talk to anyone and everyone who might have information. They go where the evidence and witnesses lead them.
For example, if a gang of thugs kills someone in the course of robbing them, the police don't stop with arresting the first gang member they can make a case against. Same goes for organized crime, etc. Just examples.
Here's a random example I just pulled up from the search "three men arrested for murder of". You could do the same using two or four, etc.
Three suspects are behind bars for their alleged involvement in a deadly shooting in Sparks in late 2022.Marc Delgado, 21, and Juan Anguiano, 19, and Raul Torre
mynews4.com
I agree.
And wish to add, if this evidence pans out as useful, it might not be useful by finding more of Rex's "gang." He could have coconspirators, but even if he doesn't, we need this evidence.
it seems quite plausible that in the end, the GB4 were murdered by just one person, the current suspect and defendant.
But is does not seem plausible to me that Shannan was murdered by just one person. Whoever her murderer(s) are, they very well could all NOT be Rex Heuermann. We could be talking about leaving other murderers, potentially serial murderers, free, by ignoring tips.
The information offered by the witnesses COULD have been information that described events leading to Karen Vergata's murder, and if they do, it certainly sounds like RH was part of it in some way. But it also could have "just" been a terrifying abusive episode Karen was subjected to, which for its depravity, is on a whole other level than murder. If that is what it was, than this tip could still help lead the way to new witnesses and clues to identify new murderers for additional victims.
One of the longest running debated theories of LISK has been how many murders are we talking about. IMO the public ally available information supports many of the theories, and none of them can claim to be definitive. But here is our chance for some real answers to that question. Thanks to the task force, and thanks to these witnesses, we have a name for Karen, and very useful information about her and Shannan Gilbert.
Both Karen and Shannan have been linked to RH in these witness accounts, but clearly not on the day of the murder for Shannan, and possibly not for Karen. The evidence has to be followed. These tips might not find coconspirators of RH, they might find entirely new murderers.
MOO