On what basis? What argument does he have over Xavi or Iniesta? Pep won 6 La Ligas, one Champions League title (in the old format) and no titles with Spain. Xavi won 8 La Ligas, 4 Champions League titles, a World Cup and two European Championships. Iniesta is identical with Xavi.
Let's remove the team success out of the equation. -Even though Pep had no shortage of playing in teams filled with superstars- These are the lists of individual honours Pep, Xavi and Iniesta have won:
Pep
1 x European Championship Team of the Tournament Selection (2000)
Xavi
1 x European Championship Player of the Tournament (2008)
3 x Ballon d'Or 3rd place (2009, 2010, 2011)
1 x World Cup Dream Team Selection (2010)
2 x European Championship Team of the Tournament Selection (2008, 2012)
Iniesta
1 x European Championship Player of the Tournament (2012)
1 x Ballon d'Or 2nd place (2010)
1 x Ballon d'Or 3rd place (2012)
1 x Ballon d'Or 4th place (2011)
1 x World Cup Dream Team Selection (2010)
2 x European Championship Team of the Tournament Selection (2008, 2012)
Xavi and Iniesta were the leaders of a football system that dominated late 2000s and early 2010s.