More than likely the case. The guy who was sitting in the other seat may have just sat in the wrong seat outright. He may have not paid attention to his boarding pass, or looked at the wrong one. I came across that a few times. They would get on the plane, and look at their connecting boarding pass (their next flight, not this one).
The guy who got off the plane probably didn't even try to find out what happened - whether it was the airline or the passenger.
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