#2 Strength on the bench
Unlike Arsene Wenger, who preferred to see through such ties with inexperienced youngsters and second-team members alone, Emery put some of his star players on the bench against Brentford on Wednesday.
The match turned a little frenetic after Judge's strike, and it seemed like Arsenal might slip up to give Brentford an opening in the latter stages of the game. However, the strong bench set up by Emery helped profusely, as Lacazette, Lucas Torreira, and Aaron Ramsey came in as substitutes to disrupt their opponent's flow.
The ploy worked, as the side looked more balanced and potent after the introduction of its first-team members. Lacazette's strike proved to be pivotal in the context of the game, as it assured Arsenal a safe passage to the next round of the tournament.