He does play 235. 235 was a lazy way of saying 2323. When the teams were printed in programmes lining up 235, the game used to be played with 2 inside forwards, 8 and 10, who were deeper than the wingers and cf. There were 3 half backs, right, centre and left, and two full backs. Traditionally in the UK, before my time, the centre half back, who wore 5, was known as the pivot and was often the best player. A lot of what Guardiola does is old-fashioned but this thread isn't really the place for that. But the pivot is an old, very English, name for the centre half.