I'd be quite happy not to read his stuff here again. I don't think it's worth getting into with him and a simple ban of his work is the most straightforward solution. I think contacting Marvel or DC's legal team before posting extracts of his older work is unworkable, so fair enough.
Although if anyone really wanted to contact him direct about posting his own copyrighted work and work out an agreement with him, then I don't see any reason why not.