Ozoner, I posted nothing inaccurate about the Lyons Girls case, but regardless of that, there is no point in discussing the Lyons Girls unless it specifically relates to the Fort Worth Trio. Your post didn't do that. It was a standalone post that didn't even mention the Trio. This one does, which is much appreciated. Like I said previously, I think it's important to stay on track and make sure that all posts here are related to Rachel, Renee, and Julie. It just gets too confusing to new people otherwise.
Also, there are no unknown security guard suspects in this case. There are two security guards. Bill Hutchins, who was interviewed by media and the FW police department, came forward and said he saw the girls sitting in the vehicle with another security guard. LE told NBC5 that they interviewed that security guard back in 2001 and he denied being with the girls. This doesn't mean that neither men weren't or aren't suspects, just that their identities are not unknown. At least not to LE.
As far as Richard Welch I'm not sure if he was in Texas in 1974. The FBI has not released a timeline for him like they did for his nephew. I would imagine this is because Richard Welch had a fairly stable lifestyle in comparison to Lloyd Lee Welch who was a drifter who traveled and worked short stints at a time as a landscaper or carnival worker in various states (including Texas in 1974).
And yes, it's very possible that discussion of suspects will soon be a moot point. I don't think that will be the case, but I'm hoping I'm wrong because I want these families to receive answers. I've always been supportive of the dive because I feel so deeply for their plight and if they want this stone overturned, I want that for them also. And if it simply ends with this theory being eliminated there's value in that, too.