Of course its all relative. Being 6'0 and above is pretty huge. Its easy to forget how small elite distance runners are. Rupp is relatively tall albeit scrawny. One time I happened to walk by him at an Oregon football game and it shocked me how small he was. When you only see him on the track being as tall or taller than just about anyone else out of dozens running, I couldn't help imagining him being 6'3" or so.