what if....

[M_aria]

If J-pop stars switched lives, would they still have the same popularity?

For example: If Hikaru Utada switched lives with Ayumi Hamasaki would it mean that Hikaru would be the more popular one right now?

Another example using Ayu:what if she had switched lives with Namie Amuro ? That would of meant that Ayu would of started witht he Super Monkeys and then released her debut solo single "body feels Exit" and Namie would of started out a bit later with her debut single "Poker Face"

I guess what I'm really trying to ask is whether you think that its the songs or the voice that makes or brakes some j-pop stars...