I think this guy is a bit overated. Sure he is a legend for Roma and he played 2 WC finals winning one of them, but in 1990 he was a reserve and didn't played a single game. And in 1994 he was world champion but he only managed to get a place in the NT due to Ricardo Rocha and Ricardo Gomes injuries.
More, i think the main reason for him to be such a legend for Roma is his 13 years of service. He played there from 25 to 38, it's like a life dedicated to one club! How many clubs have had a foreing player for 13 years?
Aldair might have been one of the best CB's from his time but so is Lúcio and he is rated at 85 for defense and 91 for BB, Aldair was very strong but not as strong as Lúcio or Chielini (Def 86/BB 92). Terry is a Chelsea legend, year after year he is on the dreamteam lists, he as a very good goal record, yet Aldair is superior in nearly everything.
Most of his numbers are above average for a CB, his dribble, pass, FK's, heading and jump, speed, technique... and he has 3 defensive stars. I'd like to sugest some numbers but i don't remember him that well (i'm sure defense shouldn't be orange though) so i'll leave that to someone that knows better, but i'm pretty sure he is overated in most stats.
I don't remember him from is time with Benfica, all i know is that he was a starter and he made a very positive impact when he arrived (6 goals in 1 season). Benfica wanted to keep him but at the time Serie A was probably the best league in the world, Aldair couldn't refuse Roma's offer.