By Josh O’Brien Liverpool legend Jamie Carragher has suggested Luis Diaz’s return to form could be a huge boost for the Reds as they gear up for the second half of the season. Jurgen Klopp’s side got the better of Arsenal at the Emirates to dump the Gunners out of the FA Cup and book their place in the fourth round of the competition. It was the hosts who enjoyed the majority of possession and clearer chances, but a late second-half flurry saw off Mikel Arteta’s men. Jakub Kiwior’s 80th minute own goal helped Liverpool on their way, before Diaz effectively ended the game with an expertly taken…