you list that air france would not have any use or interest in flybe. but you contradict yourself in your statement, saying that air france doesnt want any regional airlines, and then proceed to reel off a long list of airlines they purchased that can only survive on regional, and small city business.
Air France has regional airlines to provide French domestic services and CDG/LYS feed from European destinations (Brit Air, Régional), to provide AMS feed (KLM cityhopper), to provide feed from the UK/Ireland (Cityjet) and to serve LCY (Cityjet/VLM). Where exactly into that picture fits Flybe? If some more feed from the UK to CDG is needed, this can easily be done by Brit Air, Régional or Cityjet, you do not need an additional airline for that. So the only reason why Air France would be interested is either Flybe'e UK domestic services or Flybe's operation to French regional airports from the UK. But why should they be? Air France has systematically cut back almost all flights from the regions and routes almost all traffic via LYS and PAR (ironically, Brit Air was founded in the 1970s as a carrier to serve the UK from regional airports in western france). And I do not really see them as the big player on the UK domestic market. What remains? They could use Flybe as a bargaining chip against trade unions, but for that purpose they already have Cityjet. And finally it could be a preemptive move to keep Flybe away from setting up shop in France with bases. Not the most likely scenario.