I see where you are coming from, I think what I meant to point out rather than say a cover I should have said nobody sings an Adele song like she can because of her unique voice. The cover could still be good but it won't sound like how she could make it sound, you know? Like if someone covered Taylor Swift, that person could honestly do just as good with the right sound track but Adele has a unique voice that really can't be done by other people