Sounds shocking. I've never been on Jazz2city (I was too young on that time) but I would've liked if it was still up. However, I think we should forgive you, because everybody makes bad things in his/her life.

From the people you mentioned, yes, sadly only Dizzy is enough online to call it active.
Rocky Raccoon posts very few, but not really that much. Maybe you could send him an email or something. xD