That quote is yet another reason why Tom Simpson is my man...
Sean, if you believe that TOC developed naturally and that bunkers arrived in the hollows and pits that were formed, I suppose it would make sense that the flat opening linksland was left as is... Although, we know that the 18th green was built on top of a grave so the valley of sin was probably created at that time...
I guess Scott MacPherson or Melvyn will have more detail on this one