There is always a chance someone missed the camera it happened twice to Romber in season 7. Someone at the Golf task even said they WERE NOT there and they were. However the person that said 11 teams said Romber gets eliminated and i do believe that. If a team did pass by my guess would be its JVJ, and we might be able to see if it happens after episode one. The only reason i think a team might pass by is 4th place [OD] were flown out with other teams and they usually never happens so i think there is a chance OD go out 5th, and the forth place team is still missing.
Of course the Romber spoiler can be wrong, and Jonathan [AR6] mentioned both Romber and the blondes in his interview so maybe? The producers interview mentioning Romber, JVJ, Dave and Mary, and the frats sold me that they are the first 4 out though.