This really should have been called Brutus at the Olympic Games
No wonder Clavier didn't come back - Asterix and Obelix are barely in the movie, and when they are they have nothing to do but occasionally stand on the sidelines and watch the other actors. The film is centered around Brutus so much that it's surprising Benoit Poelvoorde didn't get top billing. Hell, even Alain 'can't do comedy' Delon probably has more screentime than Cornillac.
"Security - release the badgers."