Bielsa would have been perfect for the Barcelona philosophy.
He has only really come to light because of Bilbao's European exploits this season but thinking back to when England beat Argentina 1-0 with the Beckham penalty in WC 2002, his Argentina team had me continuously shitting myself (not literally of course but you get the drift). They seemed to be constantly offensive, short passes with the likes of Veron (who was a far better player than the PL ever saw of him) and Ortega.
Still, Tito is another appointment from within once again and I wish him well, he will certainly know the players and the club like the back of his hand and hopefully for Barcelona that will equip them well. I say that because I love watching them play, love the way they play the game and I hope they continue to do so in the same vein as they have done.