Why is Pacquaio fighting Marquez AGAIN and why is Mayweather fighting Ortiz with weak welterweight experience?

If you read anyone's comment on this forum, then you'd understand it's a comeback, get in the ring, rust removing conditioning. Timing, reflexes and overall tune up for down the road Pacquio fight. He's not going to come back from a year off hiatis and go ringt for Pacquiao. surely, as a boxing EXPERT, like you must know this.