I am not sure how many DEFO that has started the course, probably around 3-4. One had +10.000 hours and he is definitely gone.
KA is not like any other company when it comes to SOP's, Situational Awareness and common sense, so it is very likely that even experienced pilots cannot learn the KA-way of doing things - and they will be chopped.
Not sure about the other failures as it is difficult to get info out of the trainers, but there are a couple of persistent rumors on the flight deck about them failing.....