I'm always up for a good debate. I rather enjoy putting my opinion out there and debating with anyone. Just ask my wife, it drives her crazy sometimes. I just prefer to not be covered up with emails from angry hunters who disagree with me. Debating them could become another full time job.
I thought of a couple other examples. I killed my first mature buck in 2007. I believe he was a 4 or 5 year old that grossed around 130 and netted just under P&Y. I was thrilled. Ohio is a one buck only state regardless of method of taking.
Two days later I had a very nice 10 point spend almost 20 minutes under my stand. I could of killed him at any time. In a party tag state, I probably would have. That would have been one less nice buck on my property if I was greedy.
My best buck ever was killed a year or two later. I was doe hunting 2 weeks after the kill and a 6x4 buck with all kinds of character spent enough time under my stand that I think he had a death wish. The same buck walked under my stand again in that January.
I would expect either case to end up with an extra buck killed in a party tag state. I'm sure a lot of people in Ohio would kill the second buck and tag on someone else's permit. I'd be lying if I said I was not tempted. But shooting the second deer was unlawful and it would take away the chance for someone else to kill him.
It sounds like most people who can legally do it in a party state, shoot the second buck.