On a more serious note, he is a simply brilliant link in the defensive chain. The back line have ultimate confidence in him so aren't pissing around being concious of him dropping clangers. He marshals the defence close in very well and his communication is obviously superb. Those things have had an enormous effect on, for example, Sami's return to god like defending status this season. Reina is massively important in the defensive unit, can't be over estimated.