Rumors circling around of the fifth chapter between Pacquiao vs Marquez on September 2013, this could be possible since Bob Arum is working on it. I don't think there's a stop to it because Team Marquez are open, negotiations will settle the issue when Marquez will demand higher purse and Pacquiao will settle lower but not lower than Marquez. Let's accept Manny stock took a dive lately after his last devastating loss with Marquez and of course Bob will take advantage on the situation for a larger margin of the pie.
Bob is now down playing Manny's demand for April fight is a slight on Manny's armor. With the two ***** Doctor stupidity of Parkinson's diagnose flying around the world, let's say Manny's comeback is really in jeopardy. Not that it won't happen but his bargaining power is under the school bus. LOL!
Now here's the catch. With all this negative factors playing against Manny there's no way Manny could win against Marquez, I mean with all the distractions in his life which he built around him, even a class B fighter could run for the money.
Let's face it, Manny's greatest arsenal are speed and power. Take away one even the smallest number he is an ordinary fighter by all accounts and what is the most deciding factor is his age. With all the wear and tare gathered from all those years somehow it will catch him sooner or later and this could be the time. When the mind is handling the most of the load in the middle age person it's the best time to slow down or burn. This is the law of nature.