Adding dependents well after initial application

Well, there are posts that conflict with this one, and this post conflicts with what my lawyer is telling me, so perhaps the question is worthy of some additional debate and discussion?

Regarding the advice to keep renewing until all dependents are naturalized; could a GV be renewed for someone who is already a Portuguese citizen? That seems odd, and would be required if a dependent applied in later years.

Also, is there a monthly support amount required for elderly parents (between 55 and 66) to be classified as dependents?