He said "Manny Pacquiao did in fact beat me in my prime, so all these people defending me that I would have a chance against Pacman 3 years earlier, please stop it only makes you look stupid and embarasses me."
He said Mayweather is faster than Marquez and has a great defence and throws the jab very well. Marquez will have to use distance to get his shots off to counter by throwing at the same time. He said Marquez is a good fighter and can counter Mayweather's left hook with uppercuts. He said Mayweather moves his upper body very well so Marquez will have to be fast and aim for the body, basically what he said.
ok here is a brief explanation: In the first video they are talking about how elusive is mayweather and that he uses a lot of lateral movement, they talk about marquez throwing a lot of combos, in the second video they say (incorrectly by barrera) that mayweather is a southpaw and explains the shoulder roll technique, then they go on explaining how jmm`s throws the 1-2 and the uppercut before throwing the straight right hand, the other guy seems like he doesnt give marquez much hope