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Paragraph One: Ok, now I see your way of thinking and seems very logical to me. I would not be surprised to learn one day that your conclusion is correct. In fact, I've read on so many old news sites today but I thought I saw that JW texted JM at 2 am on the night of the murders... correct? So, aside from HR, those two had a relationship after HR was no longer "seeing" JW. That 2 am text caused me to think quite a bit. I imagine LE knows what the text said and they didn't arrest JW but it has me very curious. (I suppose something as simple as "any weed around" or whatever... but, quite the coincidence as to timing.)
Paragraph Two and Three: Maybe closer to the time of the murders, LE hadn't connected a red truck to the murders (and if not the R family murders then whatever other murder it was connected to yet.)
There is also the fact that text messages don't always go through immediately. I have gotten text messages at a meeting telling me about the meeting. I have gotten them a day later in some cases. When they were sent may be more reliable info. but when they were received is not from my personal experience...