Mine wasn't a response to yours. Posted at the same time, I was just slower! Just very coincidentally two of the same players mentioned.I did think of Carbone but as you rightly said he didn't quite reach his potential.
As for Emerson I was more talking about his time at Porto and when he first joined Boro, before he downed tools. Brazil historically quite often tried "wonderkids" in friendlies and at one point he was hot property.