The idea is that you can mark the guys whom you have wrestled/fought before as your past opponents. This has two advantages: you can honor the guys who have dared face you in glorious battle, AND it has a clearer semantic than the "favorites".
Also, "past opponents" only show on your profile if both guys have marked the other as such. This way, while many guys can be your "fans" (that is, mark you as a favorite), but only the guys you acknowledge can be your "past opponents".
I have also made some miscellaneous tweaks to the site's blog engine. Hopefully the new layout is a bit more intuitive.
– Admin out.