As regards the second pilot it would appear from today's Daily Mail

https://www.dailymail.co.uk/news/art...-10-HOURS.html

that Henderson's passport (the second pilot) was scanned at Nantes, the original flight plan filed in his name and Sala, Ibbotson and Henderson all passed through security at the same time. Henderson denies being there, refuses to answer questions and has deleted his facebook account. Furthermore his explanation is somewhat lame saying security must have made a mistake. These are factual matters that have yet to be fully explained but on the face of it must give rise to speculation.