The principal attorney in any lawsuit owes the duty of professional services at the standard of care to the attorney's client. Are you the client?
In a class action, the attorney owes a duty to the class, and the determination of who is in the class can be difficult over the course of the litigation.
Absent more facts about the nature of the case and legal proceeding, and about your connection and involvement in the legal matter and the underlying dispute, there is no basis for a more substantive and explicit answer.
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Can you explain what type of case this is and what you mean by principal attorney as opposed to what other kind of attorney? What distinction are you making in your mind?