JMO I'm thinking his just "walking away" is least likely, but that's JMO.
I am curious to know from those of you who do believe in that -
Where are or what did he do with the missing items?
Well for my theory #78, his girlfriend meets him at the train station and he puts his stuff in her car. I even so much as think she was driving his car (hence the seat being pushed up) and he followed in hers so that he could do the getaway driving.
I think he was hungry after all of the running around he did after work and grabbed his lunch pail.
The missing bike may not be related to his disappearance at all but, if he does have a gf, he could have brought it to her house any time before the 14th of June.
Why did he go home for 10 minutes?
To get something he couldn't leave without. Maybe a picture of his children. Maybe he took money from the safe in the basement. Maybe he changed into going away clothes but took his work clothes with him.
Why didn't he take the cash + wallet?
I think the money belongs to his co-workers.
The wallet is a tough one as maybe he did leave it there in the morning and just never picked it up when he stopped home. I'm guessing here he was in a rush.
Why would the keys + club be missing?
The club was under the seat if I recall correctly. I think it wasn't engaged due to the driver not being RM and there being a rush factor so as not to be seen. The keys I think were grabbed out of our natural habit of taking the keys when we leave a vehicle. Same for locking the door.
Did he plan this or was it a heat of the moment thing?
I think if it wasn't planned, it was talked about and RM just said, okay today is the day, I'm done.
For what reason would he not contact LE to halt the searches etc?
He will. Just not ready.
Where would he go that he would not need to use his SS# to earn money? Or do you think he had a large cash stash? Or - well I just don't see how anyone disappears like that unless they have set it up financially in advance.
Both. I think he took maybe half of the money in the safe (IMO - I have no knowledge that this safe exists except just knowing about lucrative past investments) and he could always freelance as an electrician.
Given all of my answers, I will readily admit that it is full of holes. Which is why I don't have one running theory at the moment. They are all full of holes.