From the few short moments I see of him, I find his pace pretty lacking. And it's pretty apparent when the line is pushed higher up. With Pep seemingly favouring high pressure lines, his lack of pace might be an issue.
Pep is also playing Martínez at CB when everyone is fit. Badstuber too.
Positioning/ball distribution is definatly more important for Pep.
As long as he's got someone like Boateng next to him.