Nah, this has nothing to do with being rich. Adjusting report dates for good reasons is pretty common for everyone.
Pacquiao is the one doing the suing. Since truth is a defense, Pacquiao may have and probably has opened up his records to review. It might just be review by a judge, it might not be a review of records going back 15 years, it might not be a review of everything, but expect Mayweather to get something reviewed.
Until there is a BOYCOTT they will never fight each other. Only when revenues dries up when they fight someone else, like Canelo, Guerrero??WTF?, Bradley, Peterson, then they would be forced to fight each other in order to make the kind of money they make with less risk. At that point who would care for Pacquaio-Mayweather in 2018?