You can post on the original if it's old, it's just that everyone will have to go back and get the context of what was said. The problem is that, if you are posting a response to an old thread separate from the old thread, no one has any links or references to go read the original thread to know what you're talking about.
We can wait for your reply from Brian, but others on our forum have contacted him before, but he will not hear. If you want to give it a try, go for it; you never know. I'll be interested to read about your conversation.