Any Top 10 list for Brazil that doesn't include Didi should be considered fraudulent, I think — arguably the first global star from the country, reached the quarter-final of the 1954 World Cup, Golden Ball awardee and the focal point of the team during their first World Cup title in 1958, and won another title in 1962 as an old midfield general. FourFourTwo ought to know better, tut-tut! The Top 6 should be pretty straightforward (in chronological order): Didi, Garrincha, Pelé, Zico, Romário, Fenômeno — best-in-the-world caliber players with noteworthy Seleção careers. Then it gets a bit tricky as personal biases rear their heads given the outstanding pool of old-and-new greats (some of whom are more appreciated by Brazilians themselves than the international audience): Leônidas, Zizinho, Ademir, Nílton and Djalma Santos, Zagallo (if you include post-playing career he is easily among the very best), Carlos Alberto, Rivelino, Tostão, Jairzinho, Sócrates (bonus for coolness factor), Falcão, Cafú, Rivaldo, Ronaldinho, Neymar. Would probably go with Zizinho (Golden Ball awardee in the heart-breaking 1950 World Cup (culminating in El Maracanazo), and an inspiration for both Didi and Pelé), Nílton Santos (redefined the offensive fullback role, the most avant-garde fullback from the country that has produced the greatest fullbacks in football history), Rivaldo (made a difference for the national team, time and again...in 1998, 1999 and 2002) and Ronaldinho (weaker Seleção career than the likes of Cafú or Djalma Santos, but the best player in the world at his peak and truly embodied the spirit of Joga Bonito).
P.S. Jairzinho is a strange one, and shouldn't be included in a conscientious Top 10. Produced only one great World Cup performance in 1970 (where Pelé and Gérson were more important than him), didn't command the post-Pelé generation, not someone who reinvented the wheel or massively influenced aspiring greats, and isn't as revered or loved as some older legends (or even his contemporary Rivelino). Kaká is also someone who shouldn't be given serious consideration — starred in only minor international tournaments (like the Confederations Cup and Gold Cup), and his Brazil legacy is not something to write home about.