But as an insider to the pre- Charlie Bree, Eric would, at the very least, be a useful resource.

It seems to me that the idea of unbanning him is only half the equation. Seriously, who among us would come back a year or so after being banned? How does one approach him? "All's forgiven, so now come back and give us your perspective on this trainwreck". I doubt he'd even respond. Since there seems to be no evidence that he's here under a different name, I get the feeling the XPT ship has sailed for him.