If you chill, and count to 10, you will see that I was referring to the highlighted section of your comment -
Amy was never anywhere near as big a seller as Adele has proved to be - singles or albums
It isn't rocket science why Amy wasn't as big a seller as Adele is it?
You think my 'theory' is nonsense, well touche
It certainly isn't - it's because she was never as immensely popular as Adele is right now. Simples.