Even at the time it mattered little where the men were. It was all about Jane and what she had seen at the top of the road. Be it Madeleine's abductor ... or be it innocent dad and his family returning home from the creche ... it makes no never mind. For the very simple reason that neither were traced by the Policia Judiciaria at the time.
The family didn't need to be traced. Their names were on the MW booking sheets & in the creche records for the night of the 3rd. The time their daughter was checked out of the creche should have been logged & given what SY discovered in their review it is clear only the most inadequate police force would not have pursued such a basic lead.
I kept asking myself why the family themselves thought they could have been the Tanner sighting, yet apparently failed to come forward before to eliminate Tannerman from the investigation. The main conclusion I came up with was that they were spoken to originally, it was suggested that they could be the sighting but certain elements of their recollections of that night were at odds with Jane's description. (Direction of travel, hair style, height, non-gathered lower hem of fleece/jacket). They were then told to keep quiet in accordance with the judicial secrecy laws.
All MOO.