For the record, the "unidentified FDJ rider" in this picture about the Roubaix recon
is David Boucher. Is a local from north of france, now living in Belgium near the border.
You should have easily recognized him, he is in most early break of the belgium classics. He even has the record of the number of kilometers rode in break in 1 year.
We will probably see him again on sunday in the early break.
I don't want to be rude but I see a lot of those race gallery with unidentified riders in pictures. While it is excusable this time as you can't recognise the face of every single rider in a non officialy recorded event such as a recon ride, you have the start list of every single races and follow the events closely. It shouldn't be that hard to do your homework and identify a rider based on dossard/plates numbers and official race information.