Here's my opinion on the elmore drama - absolutely NO credit or acknowledgment to the jerk. If he did nothing, then why do it - because he's pressuring you? He can't do ANYTHING about it. Especially with what you now have in writing from the LoC. I'm sure you've already laid it out for him that you've used nothing of his - that's the end of the story and discussion. If you want to write him one last time and inform him of what the LoC said, and that you are seriously considering what he's doing as harassment, and that you will not respond to any further e-mails. Because if you keep this dialogue open he will continue and continue and continue.
I've had some problems with supposed rights' holders for scores over the years - they write, they yell, they posture, and I write back, state the reality, and tell them they will receive no further response. They have occasionally written a second time, and I put those e-mails directly in the trash, unread - and I never ever hear from them again.