Of all the things that seem to be in the way of a Mayweather Jr. vs. Pacquiao fight, and there are many, the boxing fans claim that Bob Arum of Top Rank is one of the primary causes of the inability of this bout to materialize.
While there has been, and possibly still is some bad blood between Top Rank and Mayweather Promotions (along with Golden Boy Promotions), it is the money that dictates the flow, and it’s the promoters who would ultimately secure a safe and financially care free life for their families’ future.
In a recent interview with USATooday, when Arum was asked whether he still intends on pursuing the mega-fight, Arum gave a long answer:
As expected, the two names that are involuntarily intertwined forever, Manny Pacquiao and Floyd Mayweather Jr. are back where they belong: in people’s heads and forum boards.
When Freddie Roach and Alex Ariza got into a scuffle, it was evident that this fight, at least the competitive angle of it, is going to change its course. Verbal back and forth is always a part of boxing, its marketing and hype. Nevertheless when Alex Ariza kicked Freddie Roach and made fun of his Parkinson’s, he signed his respect away, and boxing fans are unlikely to give it back anytime soon.
This is OK in an event in the United States. But we’re going to throw huge security around this, because this is not something that is appreciated by the Chinese. I think, that with all this undercurrent that’s going on, it’s going to be like Hagler-Hearns,” Arum recently stated in response to the scuffle between Freddie Roach and camp Rios.
The most difficult part for Brandon Rios in facing Manny Pacquiao, is not the physical or even psychological portion of it all, but the significant difference in Pacquiao versus any other opponent that Rios has ever faced. The unexpected surprise that Rios might encounter during the fight, the revelation that Pacquiao is significantly faster and stronger than team Rios had anticipated, may force Rios to abandon any fight plan, and try to swing hard in hopes of landing a “Marquez” punch.
When it comes to leaving no doubt in the eyes of the boxing press and the fans, ‘Son Of God’ is a virtuoso. Being a second best pound-for-pound fighter in the world, Andre Ward has to not only sweat bullets when it comes to training, but perform in a way that suggests his absolute dominance from bell to bell. 
While I was sure that Mayweather Jr. vs. Pacquiao was nothing but a fantasy at this point in time, it seems as though Freddie Roach hasn’t yet let go of the possibility of the fight happening in the near future: