Although it was stressful, last night’s victory against FC Porto will live long in the memory of every person and player associated with Arsenal. Porto proved to be a horrible stylistic match up for Mikel Arteta’s team, who were doing everything in their power to forge a comeback. Fortunately, Martin Odegaard delivered a moment of pure brilliance when setting up Leandro Trossard late in the first half. And although Arteta’s side weren’t then able to add a second, they did have the mental fortitude to win the game on penalties. It was a seismic night at the Emirates, and it wouldn’t be a surpri…