You also need to look at the player personality, is the player responsible? he log in before or after raid time? does he finish the raid? or he need to leave, or he like to ninja dc , he accept criticism?, he have interest to raid? he like to argue with other people? You dont really ask for raiding experience if the guy has never raided, the most important thing is: responsibility and interest. Interest lead to curiosity, the guy probably will start to research and see how he can improve, also he will be more likely to read the fights and have patience.