By Dan Marsh Roy Keane insists Liverpool are now the favourites to dethrone Manchester City after the Premier League champions drew 0-0 with Arsenal at the Etihad. The Reds started the weekend a point ahead of City but behind the Gunners on goal difference. They leapfrogged both of their rivals, though, courtesy of a 2-1 win over Brighton. And Sunday afternoon’s stalemate in Manchester means Jurgen Klopp’s men will head into the next match day with a slender two-point lead at the summit. Few people tipped Liverpool to compete for the title this year following a summer rebuild, but the Reds are…