To hit Manny with his jab May weather needs to do one of two things. First, he needs to get his left foot outside Pac's right foot, make him jab and then jab back over the top. Being taller and having a reach advantage he can do it but maintaining the foot position would make him use his legs more than I expect he wants to
The other option is what I would tell him to do. Give Pac the position he wants- his right foot outside- and encourage him to throw his straight left. May weather gets behind his left shoulder so the right hook isn't going to hit him. PAC wants to work his left; every time he does, jab. Floyd has a fast jab and his left his closer to Manny's head than the straight left is to his.
And Manny has to get himself past that left to land his. Start it low and bring it up and it is a damaging punch.