Would you leave your wife (who I guarantee couldn't drive) alone in the car knowing that you might get shot to death yourself?
But if you look at my speculation, I clearly suggested Ruby went down, after wiring the money, to the DPS to see what was going on. He thought at this point, that Oswald had already been moved, as he had been told the previous day.
So you see his leaving his wife/dog in the car, at this point, was NOT in anticipation, that "he might get shot to death". It was in going down the ramp and being told or realising that Oswald had in fact, not been moved. Then the fear of being wacked by the mob, set in, and he then stepped forward and killed Oswald, as he had been ordered to do so.
I'm not saying this is how it happened, I'm just offering an alternative explanation for Ruby being the hired killer but not being in the DPS at the time Oswald was scheduled to be moved.
Again this is speculation, as opposed to the official reason that he did it to save Jackie or to be the man that shot the man who killed JFK.
And if Ruby was in on the alleged conspiracy and was ordered to bump off Oswald...can anybody give a reason for Ruby NOT being in place..on time..to carry out the murder.