I'm unsure how conflict of interest rules apply in this type of situation, but the role you play in the decision making process may be called into question whether it was impartial or not. If you cast enough doubt then all decisions made or advice given may have to be revisited.
Disclosure rules are usual pretty stringent
I have no idea what the complaint against Mr. Lea was but assuming that it was for some type of misconduct (typically the reason why someone would complain to a professional association) then the people filing such a complaint should be protected against retaliation. It is not the complainants fault that it took a year for the association to inform Mr. Lea. If this anonymous group advocating on behalf of Mr. Lea was looking for fair disclosure then they would publish both sides of the complaint.