There are people party members not satisfied with the current happenings. Although, they discuss their reservations privately, but, no one has the courage to speak out in public except the members mentioned by you. It is one of the biggest problems in Pakistani politics that you have to go with the party line (i.e. line of the owners of the party, like Sharifs, Bhuttos and now Zardaris), otherwise their is solo flight.

These members may be hundred percent right in their stance, but who cares for such lonely people. I think as long as Zardari keep their members happy (financially and by giving ministries), there is no threat to the party. However, this can become a problem if some invisible hands try to dislodge the party (given their corruption and worst governance) or they are in opposition.