Do you realise that both girls are trained singers and both boys are untrained singers in the top 4.....
Rex's basic quality of voice is really good... as a person - perverted
RR - great singer - nice person - a little naive (dumb?)
Qazi - great guy (His Saaki Saaki - dance and singing were too good) - singing - leaves a lot to be desired - but the world is full of bad actors/painters/singers/bookwriters - who are very successful
Arpita - she has created this image of great singing / prfoessionalism - she is not a natural born singer - even after all her life of training and dedication - she is besura and off-key too much - to make it anywhere in this field