This a very simplistic opinion and whereas it may seem common sense to you, it is very outdated and no longer common. Here, Euro '12 finali - Spain Vs Italy deployed Pep's tactics from Barca. Then Pep was playing Cesc as a 9 to fill in for Messi. Spain boasting traditional strikers in Torres, Llorente and Negredo, instead chose to play a modern 9 in Cesc. Italy played a traditional 9 in Ballo and an SS in Cassano. The finali ended 4 - 0, with Italy being outclassed.
The game has progressed so much now with keepers initiating attacks through slow build-ups. It's no longer the time of hoofing it up to your big striker to flick it on as Bielsa recently mocked in his press conference.