i recently found this gem who is a 4.5* potential for santos, aswell as another 4 or 5 3-3.5* players all aged between 16-18, santos has amazing regens!!!
Generally depends on your playing squad
When I played lower league, if i'd scout very good players i'd be told they were 5* because of how much they were better than my current squad but once your team is of average ability or whatever you generally won't get a 5* rating I don't think.