There’s no doubt that an FA Cup tie against Liverpool presents a huge opportunity for Mikel Arteta and his Arsenal side today. Not only do Arsenal have the chance to knock out a rival in pursuit of silverware, they are also desperate to build some positive momentum. Defeats against West Ham United and Fulham have completely soured the mood at the Emirates, and have also damaged Arteta’s title hopes in the short term. That being said, the first half of the season has also given reason for optimism, there’s still plenty to be positive about in North London. And ahead of this big clash against ta…