Arsenal definitely knows if they want to be table till the end of the year they have to win this match but this does not mean West ham will be sleeping in the match. I guess we all can agree that Arsenal will win this match but I don't they will be topping the league for long, Liverpool more likely will be crown Epl champion, since City are far from their best and still continue to have injury woes
What gives you the assurance that Liverpool will be the club that will be this season winner of the EPL. You are too quick to judge because we just got to half of the season with 19 matches played, this cannot make you give Liverpool the favorite club to win because they are topping the league. If Arsenal has being topping the league for few weeks now and still they can't beat their chest to say that they will be the winner. Manchester City started topping the table in the beginning of this season but now look at where they are. Every club will still be faced with their misfortune and whoever an overcome it with losing much points will win the league.