Maybe the alibi's weren't as ironclad as we were led to believe. As for motive, anger at Bob for putting an end to freely handing out moolah. He was no longer a single man, and it would be inappropriate for a married man to be giving lots of money to another non family member. Perhaps he/she wasnt going to take no for an answer and got violent, after luring Bob out of the house. Go back and reread Paul Estes posts. I forget what user name he had here, but something he posted stuck out, imo, based on the most recent msm.
Another thought on the I'll give you x amount now and x amount later, why not do that and get rid of both Bob and Fontelle? Imo, if it were a paid deal, it makes no sense to do away with one and not the other after the marriage took place.
I'm sure the person who was sued by Bob's daughters knew Bob's schedule well enough that she/he knew the cleaning lady usually came over on Tuesdays. Maybe she/he was hoping to convince Bob to give her/him one last big sum before Fontelle was expected back, and Monday was the day because they thought the cleaning lady would be there Tuesday.
It does make a certain amount of sense to try making one last grab at the money before Fontelle came back. If the barber and her husband were at Bob's house, then they'd already decided what they were going to do well before they got there. IMHO there would've been no time to get into an argument. If Bob didn't immediately cough up the money, he would be taken away. To be killed or held for ransom, and perhaps he died purely by accident. I can also see a reason to do away with Bob and Fontelle at the same time, in order to have a clear path to the money. Except the family would be the first ones to be suspected. Unless someone was skilled at staging a crime scene of a murder/suicide, or Bob had a known enemy they could throw suspicion on, then it was risky strategy. IMHO, and just my opinion, it is a lot easier to cover up a crime by making it appear as though no crime occurred. As it is now, people can argue that Bob became confused, had a psychotic break, or what have you, and walked away. No one is certain a crime took place at all.
I had forgotten about the barber and her husband to be honest. These were the ones who were arrested and then let go? Sure, it's possible they were paid to do away with Bob by a family member or members, although the mutual dislike on both sides makes it seem highly unlikely. I hadn't read the threads for so long I was under the assumption it was two different people, perhaps associates, colleagues or people who had worked for, or worked under Bob. But anything's possible. It might seem like a really stupid idea to pay these people to kill their golden goose, and then try to set them up to take the fall, but it's a possibility I can't entirely discount.
Anyway, not to argue with you, Cubby, as your theory is reasonable, and could very well turn out to be the case. The only thing I'm firm about is that Bob left no trace of what happened to him, whether it was intentional or just dumb luck. Beyond that, I just don't know.