Exploring without the rover
Sites were chosen according to how far the astronauts needed to go. A successful 13 and 14 would have meant a place without rover (therefore Censorinus Highlands was a selectrion).
Copernicus, Tycho or Aristarchus would have meant a rover, therefore 18, 19 or 20...
Very likely, Lovell would have made it to Cone crater.
