No, it didn't soon become clear he had been in the area. He was missing on Weds, by Friday they were still focusing on the path from the beach in Ayios Nikolaos to Pedi.
On Saturday morning police start searching the mountain paths based on new CCTV evidence showing he took a path into mountains.
Dr Mosley was found on Sunday.
So it didn't 'soon become clear' that he could have been in the area.
Apparently Dr Mosley’s family were there looking for him and very close to where he was found, it would have been horrendous for them to discover the body when its location could have been known days before.
But that just reinforces the point that he wasn't visible. Even his family were close to where he was but couldn't see him (as he was behind the wall).