Pep does need to change the whole thing because the whole thing has aged dramatically in the last three years. I'm not sure who these players are who you think that Pep is going to get more out of, but for me it certainly won't be Kolarov, Zaba, Mangala, Demichalis, Cabalero, Fernando, Navas, and Bony. That's 8 players who realistically should get nowhere near a side which has aspirations to win the CL and the PL. And I like one or two of those players, they're honest pros and do their best. But the difference between what Pep requires and what those guys (and one or two others in our squad) can do, couldn't be anymore stark.