It seems that you implying theres a special bond between ETH and FDJ, do i missed something because i've never heard news regarding their special relationship during and after ajax? And players will have many other things aside of relationship with former manager to consider when choosing their next club: the prestige of the club, the prospects of winning titles, reputation, country or city where the club is located, including inputs from their family. the prospect of re-uniting with former manager isnt going to cut in if the club lack of those, especially when other better organized clubs are knocking on your door.