If he beats Floyd, which I don't think he will, I'll eat my words and rank him in the top 20, depending on the fashion in which he does it, possibly even top 15. Same goes for Floyd if he beats Pacquiao. However, I don't think most fans will ever give PBF the credit that he deserves for his skill-set.
Also, I really don't see how people can possibly be ranking him above SRR, Armstrong, Ali, Leonard, Duran, Hagler, etc. Not one, but two highly disputed matches against JMM? Please..