I wished when it came to part distributions they followed the bp route, everyone sings the part they want and vote on who sounds the best because I'm sure jw would get half the lines he gets since cmiiw someone once said the producers pre determine the parts and they have 1 day to record
I think it's safe to assume they probably work differently with different producers and I think wakeone has a say as well cuz what musically inclined individual would give jiwoong lines