Arsenal have bigger fish to fry and the evidence was provided by Arsène Wenger’s decision to give the night off to every member of his starting line-up from Saturday’s Premier League win over Newcastle United. The visit of Liverpool on Friday looms large. But after the whistle had gone on this Carabao Cup quarter-final, the manager wanted to progress just as much as his second-stringers needed to impress. He got his wish. It was hardly a …