There are only two styles that Pacquiao have not figured out yet to date IMHO. That is the backing-up/counters, (JMM 1&2, EM 1, and MAB 2) and the slick+(dirty style), for lack of a better term, of fighting (Agapito Sanchez, Torrecampo, 3k battery).

Erik Morales, almost lost the first fight when in the last few rounds, he decided to slug it out with Pacquiao. We must consider that Morales has... superior hand speed much like Marquez and Barrera. That is the reason why they can hurt Manny. With that handspeed, they can trade a bit on instances, when opportunity presents itself.

If you fall under that hand speed with your list of skills, better not trade punches, for it will work severely against your conditioning!

Body blows when unsuccessful is easily susceptible to violent counter punches!