Weyland is the main representative of human fallen nature.
I myself would use him in flashback... maybe like in Bergmans films
Weyland and David playing chess (death allegory) in some great room filled with art and symbols of human achievents throughout history; they would speak about god, creation, life, existance, universe, their aspirations but through that dialog they would show their inner characters to the audience. Thats the only meaningful reason to show us Wayland again,
because he will show us that bad side of humanity, but also the nature well hidden
in Davids memory