Fuck sake. I'd just started to get a bit hyped for this again (after it lost it's allure a little following Jones' fortunate draw with Byrne).
Rivera isn't a great replacement as he appears to be shot, although at least it's a name, and he's not easily stopped and probably better than most Purdy opponents. Could have been a lot worse at short notice I guess (i.e. as bad as Groves' opponent).