I personally think he will fight Ortiz or Paulie on the Mayweather undercard in May and that sets up the September match with whoever wins.
Makes a lot of sense
Yes, in a perfect world that would be fair. Maidana would crush Khan today. Maidana is a smarter, better trained, and all around better fighter than when he fought Khan three years ago. Khan is not anywhere near as good as he was three years ago. Maidana probably would have KOed Khan the first fight with a proper referee. But Khan gets the Mayweather fight next May and there is nothing anybody can do about it.