I wasn't overly impressed by Sancho, he seemed very reluctant to run at Nunes - but it wouldn't surprise me if that was under instruction.
I think he also suffered by not being as dynamic as Buendia was before he came on, and not as involved in seeing out the result as Guessand was when he went off. He was there for the middle "manage the game" bit rather than the bits that got everyone on their feet. And they all managed the game really well, so...job done I guess.