#2 Torreira
There's a reason why Lucas Torreira's chant is reminiscent of that of Vieira's in the day and during the "winning" Wenger years.
He brings the same tenacity and midfield strength that Vieira added in his prime at the club, and Arsenal has lacked a player of Torreira's nature in the midfield for years. Vieira was perhaps more progressive than Torreira, but certainly, he can be an heir to Vieira.
His presence was more than enough to match that of Fabinho and Milner, and he was pivotal in Arsenal's early pressing game and trying to destabilise their game.
Naby Keita was missing for Liverpool today, but whether his presence would have altered matters is moot. What is certain is that Arsenal's midfield balance has enhanced vis a vis the latter Wenger tenure, and the introduction of Torreira has been elemental in this shift. Ensuring a strong midfield balance is key in Arsenal regaining a top-four place.