I would be very surprised if Kenya Airways has rejected ANY applicant matching from Flying Blue. After making the decision to set up their own frequent flyer programme, and knowing that there was no way to "transfer" Flying Blue miles across, it would really be exceptionally poor service to fail to match the status held in their erstwhile programme in their newly-minted Asante programme.

(And they are matching from all programmes, not just from Flying Blue; they may decide to reject applicants matching from some other random programmes, but I would expect any application from an FB member to be approved without hesitation)