I know that Floyd’s official weight for that fight was 150lbs, which means Oscar would have needed to weigh 168lbs or more to have exceeded Maidana’s 17lbs weight advantage for the first Mayweather bout.
I do know that De La Hoya weighed 158lbs for the 7-day weigh in though.
I don't remember where I read or heard it, but remember they were saying Oscar was 164 for the Floyd fight, and weighed 17 pounds more than he did when he fought Pacquiao. (147)