Yes, that makes excellent sense. No doubt that he was already living a good life. He did not have a steady job. Maybe Abigail was already supporting the couple. So in his place - I would have waited.
It seems that in quite a few episodes the murderer could have waited or not committed the crime in the first place. At least in my opinion. Also, in some episodes the alibies made the crime even easier to solve. I think that is why I like the 'sudden' murder cases more than the others - and I do like the others. Death Lends a Hand and Port - the murders were not premeditated and the episodes are great.